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1.
A large, nut-filled turd that hurts the ass upon exit.
Man, that crap hurt! It was a real ass cactus!
by Bigsteve February 24, 2005
 
2.
An unpleasant person, a pain in the ass.
Man, my boss was a real ass cactus today!
by Jay Young April 19, 2005
 
3.
The conditon in which a man or woman has such prickly ass hair, whether it be from feces or it just grows that way,that said persons ass hair has the sharp prickly quality of the needles of a cactus
1. Dude i haven't wiped in so long i'm starting to develope asscactus.

2. Hey man i was humpin this girl last night and it was all good until I decided to go doggie style and the bitches asscactus was so sharp that it almost pierced my dick.
by JakeYkins March 07, 2007