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1.
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
1176 513
 
2.
dirty thingz two people do 2gether behind the scenes
ashley n mark are gonna run sum flexes
by whitepplrstupid July 05, 2005
62 65
 
3.
to roll a nice L
"yoo my nigga watch me flex this blunt"
by ablazingape May 09, 2012
166 177
 
4.
(Verb) to put up a fake front.
"Man you see all you guys are so fake, yall be flexin!"
by SirEli April 29, 2010
239 262
 
5.
To dance, generally in the form of a man and woman with the woman's buttocks grinding against the man's genital area.
Pull dat gyal dey and take a lil flex na boy
by trinichic11 August 06, 2009
43 67
 
6.
1) To be wearing a particular item

2) To have and item on one's person

3) To have one's hair (facial or other) cut/styled in a certain way
1) "What a legend, he's flexing dungarees"

2) "Oh, are you flexing an iPhone these days?"

3) "Dude, I can't wait till I break up with my girlfriend so I can finally flex a Hogan (moustache)"
by Guppy316 May 09, 2009
15 39
 
7.
A dance, popular with go-go music.
A son you hear that new impressions, I'm about to do the runnin man

boy that's dead, you betta get'ta flexin
by B11, your info. source May 15, 2010
48 74