Slang almost never comes with a birth certificate. Most expressions reach a group chat secondhand, stripped of the room where somebody first said them. By the time a brand account picks one up, the people who started it have often moved on. Online slang is a partial exception. It leaves timestamps, and timestamps can be checked, which is more than you can say for most of the stories that get repeated about where a word came from.
One post, and a footnote
“On fleek” is about as close as online slang gets to a dated birthday. Merriam-Webster traces the phrase to a Vine posted on June 21, 2014, by a teenager going by Peaches Monroee, who later said she made up “fleek” on the spot. The clip was about her eyebrows. The phrase did not stay there.
The footnote sits in the same entry. The dictionary notes that “fleek” had turned up on Urban Dictionary in 2003 and again in 2009, with loosely similar meanings. That doesn’t make her account false. Two people can land on the same invented word, and an old crowdsourced definition is not evidence that anyone was saying it out loud. What the footnote does clarify is the phrase “first known use,” which really means the earliest example anyone has found so far. The Vine is documented. The tidy origin story is a claim built on top of it.
Online slang that is older than the feed
Plenty of what gets filed under internet slang is older language from one community that suddenly got far wider distribution. “Throwing shade” is the clearest case. When Merriam-Webster recognized the slang sense, Essence noted that the word’s history runs past RuPaul’s Drag Race, which brought it to a TV audience around 2010. It goes back to the 1980s New York ballroom scene that the 1990 documentary Paris Is Burning recorded.
Platforms sped up that trip, but they didn’t write the vocabulary. They did change what the words do. In the ballroom usage the film captures, shade is closer to a craft: an insult indirect enough that the target has to finish it for you. On a social feed it can mean nearly any mild criticism. The word made the move. Most of the skill stayed home.
When an old phrase gets a new job
Sometimes the movement runs the other direction. “Brain rot,” Oxford’s Word of the Year for 2024, is first recorded in Henry David Thoreau’s Walden in 1854. Oxford University Press says Thoreau used it to fault a society that favored simple ideas over ones that demanded effort. Usage spiked in 2024, as people applied it to the fog that follows hours of low-effort scrolling.
So no online community invented “brain rot.” It’s a 19th-century complaint that happened to fit a 21st-century habit almost exactly. Thoreau never had a recommendation feed to review, though it isn’t hard to guess his rating.
What a dictionary entry actually proves
A Word of the Year or a new dictionary entry is easy to read as proof that “everyone” now says a word. The evidence is narrower than that. Oxford picked brain rot after a public vote of more than 37,000 people, weighed alongside its own language data. That’s real evidence of attention. It isn’t a census of how people talk. An entry shows that a word has traveled beyond its home community, and says nothing about who uses it now or whether the original speakers still do.
That gap points to a familiar pattern. It’s an observation, not a measured rule. A community coins or repurposes a word. A show, a streamer, or a single clip gives it a bigger stage. Outsiders use it more loosely, and somewhere along the way the dictionaries catch up.
Where a word goes after that is harder to call. Shade has settled into ordinary speech and looks like it plans to stay. On fleek now sounds like one particular summer on one particular app. Nothing in the timestamp predicts which way a word will break. That gets decided afterward, one conversation at a time, by whether people keep finding a use for it.
