As far as urban slang, the definition is "to show off." Used by many rappers, most notable Ice Cube and the Geto Boys. Originated in the urban community, and has been used for quite some time.

"...no flexin', didn't even look in the nearest direction as I ran the intersection. (This is said because Ice is trying to get away from some people who tried to kill him the other day In the song, of course)" -Ice Cube, "It Was a Good Day"

by The Boston Rag February 27, 2005

Flag

Get the Flex mug.

FLEX

*FLEX* is a phrase you type into poker chat boxes that indicates to the opponent your great strength, and the impending doom they face unless they choose to fold, leave the table, shut down their computer, and stick the monitor into an industrial trash compactor.

pokeraces has 7 seconds to act.
Notjitsu: *FLEX*
pokeraces folds.
pokeraces has left the table.

by Wally McMillan February 4, 2008

Flag

Get the *FLEX* mug.

flex

jai

person 1: "im so dedicated to football, I just smashed out a great training sesh im so good. like the academy just made me pro u should've seen me repping the goals at training today . plus my brows r on fleek today. also did u know also there's a town in Germany called Burmeister."

person 2: "geez that guy is such a flexer, I bet his name is jai"

by personwhoknowsalot March 30, 2020

Flag