Someone that is an uptight douchebag who lifts a lot of weights and thinks they are tough shit.
That guy just bumped into 60 year old lady cause she was in his way, what an Ass Flex!
by Slobo March 3, 2008
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one who is a master at flex ones ass muscles!
How you doing ass master flex
yo dude im flexin ma arse yo!
shizzle ma nizzle ass master
by amander March 31, 2005
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