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The name of a mans ass when he is inbetween shaving and his ass is prickly hence cact-like.
"So how hairy is he?"

"Lets just say if he stopped shaving he'd have a cactass"

by Sotamaster November 20, 2010
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One or more buttocks and/or thighs with cactus spines in it, usually the result of an accident.
He crashed his mountain bike into a patch of cacti and came out with cactass. Because he could not pull them all out on his own, his buddies had to help.
by PedalPusher July 03, 2006
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