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act a ass 

to show off, to stunt, to act wild
I'ma act a ass!
Might roll glass!
It's the mista masta and I keep a G stash!
I'ma act a ass!
Might roll glass!
I took a sh*t on the stage at the grammys!

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"Look at that boy swangin' with his head out the window; he actin' a ass!"
act a ass by JethroMan April 20, 2008

The act of ripping a girl's ass and pouring shampoo down the middle. 

Herbal Essences is the act of ripping a girl's ass and pouring shampoo down the middle. According to Urban Dictionary, at least.