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"
dirty thingz two people do 2gether behind the scenes
ashley n mark are gonna run sum flexes
bed room parties
were having a flex at my house
A Clan on Xbox live comprising of Hackers and Trolls. An overall less than average clan with the exception of hacking.
Used to describe malicious players in Call of Duty: Black Ops, or other Xbox Live compatible games.
Showing off how good you are at Hacking and Trolling in the above-mentioned Games.
"The F.L.E.X. Clan is full of cheaters!"
"John McCain is quite the F.L.E.X. er"
"Hobowner loves F.L.E.X. ing"
to roll a nice L
"yoo my nigga watch me flex this blunt"
To lend something, or to give something
'brer, flex me yo' fone'
What Mike Vick does to people.
Vick was about to flex on dat fool till he got his wheel all broke up.