Street voices
"Flatlining someone, meaning to knock them out cold. Oh my God, dude, did you see Oliveira vs. Topuria? No, who won? Dude, Topuria flatlined Oliveira, bro. I'm so heartbroken."
What it means
Means knocking someone clean out with one heavy shot or a brutal hit, usually in a fight or combat sports chat. It plays on the heart monitor flatline image, so it's meant to sound dramatic on purpose. You use it when somebody doesn't just lose, they get switched off in one nasty moment.
Usage examples
"Bro, you missed the main event, Teporia flatlined someone in round one and the whole bar went dead silent for two seconds."
"One clean punch and he was flatlining the other lad before the bell even rang."
"That tackle was brutal, he ended up flatlining the winger right on the touchline."
"He caught him with that left hook and flatlined him, proper lights-out stuff."
"Man got flatlined in sparring and the whole gym went weirdly quiet for a second."
Other ways to say it
Editors of this term
Good-Vibes Courier Official watcher of this expression
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