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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
Also used to describe someone wearing something.Sometimes proudly to make it seen.
(2 men in the mall)
Man1:I got my new Aj jacket man
Man2: Yo your tryin to flex that jaket man
by andre.. February 23, 2005
dirty thingz two people do 2gether behind the scenes
ashley n mark are gonna run sum flexes
by whitepplrstupid July 05, 2005
to roll a nice L
"yoo my nigga watch me flex this blunt"
by ablazingape May 09, 2012
(Verb) to put up a fake front.
"Man you see all you guys are so fake, yall be flexin!"
by SirEli April 29, 2010
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

A FLEX is when a man meets up with a women, with the intention of escalating the situation sexually with the goal of getting laid.

Often times flex's are arranged via the internet, with people who have never met in person before, but have pre-arranged to have sex via the mircale that is the internet.
Im going on a flex tonight.


That flex last night was weak.


The girl on that flex last night did not give me what I expected.
by TrickDa1a April 18, 2007