Millennials came of age during a particularly strange technological in-between. Generally defined as people born between 1981 and 1996, this generation remembers a childhood before smartphones and social media but was still young enough to embrace both as they became part of everyday life. They watched dial-up internet give way to Wi-Fi, carried portable CD players before downloading music, and learned to communicate online long before being permanently connected became the norm.
That combination of analog childhood and digital adulthood left millennials with plenty of cultural fingerprints, including their own vocabulary. Growing up in the 1990s and 2000s meant absorbing slang from teen movies, hip-hop, reality television, early internet culture, and endless hours of MTV. Some expressions traveled from school hallways and AIM conversations into everyday speech, while others got so tied to the era that using them today can sound like announcing your birth year without actually saying it.
Language rarely stays loyal to one generation for long. New slang arrives, old favorites turn ironic, and words that once sounded impossibly cool eventually leave younger listeners wondering what anyone was talking about. Still, certain expressions remain unmistakably millennial, carrying a little piece of the pop culture and early-internet world that shaped the generation.
Stacker compiled a list of 18 slang terms that defined millennial vocabulary, drawing on internet-culture retrospectives, slang dictionaries, and pop-culture coverage of the words themselves.
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1 / 18Paying bills, making appointments, doing laundry, or accomplishing practically any other mundane grown-up responsibility could qualify as "adulting." The playful use of "adult" as a verb took off as millennials entered adulthood, giving them a convenient way to celebrate or complain about doing the things adults are simply expected to do.
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2 / 18Short for "you only live once," YOLO turned into a rallying cry for spontaneous decisions during the early 2010s. Millennials could deploy it for anything from booking an impulsive trip to ordering another round, often with at least a hint of irony.
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3 / 18Something "on fleek" was polished, perfect, and exactly as it should be, especially eyebrows. The phrase spread fast after appearing in a viral Vine in 2014, tying it closely to one of the social platforms that defined millennial internet culture.
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4 / 18Sometimes a complete sentence apparently required neither a subject nor a conclusion. "I can't even" caught on as a catch-all reaction for being overwhelmed by something hilarious, ridiculous, frustrating, or simply too much to process.
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5 / 18Social media made it possible to know exactly how much fun everyone else appeared to be having without you. "FOMO," or "fear of missing out," gave a name to that uneasy feeling and gained real staying power as millennials navigated the rise of Facebook, Instagram, and an increasingly connected social life.
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6 / 18Calling something "basic" meant it was painfully conventional, predictable, or attached to an overdone trend. By the 2010s, the label had latched onto everything from pumpkin spice lattes to UGG boots, turning an ordinary adjective into a distinctly millennial insult.
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7 / 18Why bother saying "totally" when one syllable could apparently be sacrificed? "Totes" served as enthusiastic shorthand for agreement, and variations such as "totes magotes" pushed the expression even further into peak millennial territory.
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8 / 18"Bae" spread quickly as a term of affection for a romantic partner during the 2010s. The word has roots in African American English and was eventually picked up so enthusiastically by mainstream culture and advertisers that using it sincerely became harder by the year.
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9 / 18Social media provided fertile ground for bragging while pretending not to brag. A "humblebrag" disguises an accomplishment or enviable situation behind self-deprecation or a complaint, letting someone show off while technically acting like they're doing the opposite.
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10 / 18An apology with no actual regret behind it turned into "sorry, not sorry." The phrase let millennials acknowledge that someone might disapprove of what they said or did while making it clear they had no intention of changing it.
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11 / 18"Low-key" is an easy way to soften an admission or describe something happening without much intensity or attention. Saying you were "low-key obsessed," for example, could mean you were quietly interested, even when everyone around you knew the obsession wasn't particularly quiet.
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12 / 18"Throwing shade" describes delivering an insult or showing disapproval without necessarily stating it outright. The expression originated in Black and Latino LGBTQ+ ballroom culture long before millennials adopted it, eventually working its way into mainstream internet and pop-culture vocabulary.
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13 / 18A particularly enviable group of friends could earn the label "squad goals." While "squad" has deeper roots in hip-hop, the expanded phrase caught on widely during the 2010s, when carefully curated group photos turned friendship itself into something to aspire to on social media.
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14 / 18Spot something embarrassingly relatable online? "It me" was all the explanation required. The intentionally incorrect grammar gave millennials a self-deprecating way to recognize themselves in memes, jokes, and situations that hit a little too close to home.
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15 / 18Being hungry is one thing; being so hungry that everyone around you should proceed with caution is another. "Hangry" combines "hungry" and "angry" into a convenient description of the irritability that can arrive when lunch is taking far too long.
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16 / 18As dating moved onto screens, disappearing from someone's life became much easier. "Ghosting" describes suddenly ending communication without explanation, and the term stuck in millennial dating culture as apps and constant smartphone access changed how relationships began (and sometimes ended abruptly).
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17 / 18Eminem's 2000 song "Stan" introduced the name as an obsessive fan, but its meaning evolved as internet fandom grew. By the 2010s, millennials were using "stan" as both a noun and a verb for enthusiastic support of a celebrity, musician, show, or practically anything else worth obsessing over.
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18 / 18Losing gracefully was never really the point. "Salty" described a bitter, sore-loser kind of annoyance, the kind usually reserved for exes, sports fans, and anyone who couldn't let a minor slight go. The word borrows from sailor and hip-hop slang that predates millennials by decades, but 2010s internet culture is what turned it into a go-to way to call out pettiness.
