Anyone who thinks they are tough or tries to act tough. This may or may not be the case.
Ok Flex, quit picking fights, your 5"7" and weigh 125 lbs.
by aceface April 15, 2004
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a meaningless word used to enhance an adjectives power. generally used to emphasise feelings of laziness or disgust.
"you commin marvins tonight?"
"naaaah bedjin, das a longflex"

*two men hugging in view of rudeboys*
"nah staaar das a battyflex"
by roxxor February 19, 2004
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Sex using a variety of positions, requires you to be flexible.
'we don't have sex, we have flex'
by Shareapenis July 28, 2009
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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
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To exit or flee an place, gathering, or event.
Similar to the word "bounce."
Bigger Crew Boss: "Why don't you fellas stick around for a little while?"
Smaller Crew Boss: "Nah. We gotsta flex."
by Heroic Flow June 06, 2007
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