1.One who's level of intelligence is comparable to that of their own ass.
2.One who's actions suggest that they might be thinking with their own ass, though it, like their brain, lacks the ability to make intelligent decisions.
See also dumnass
dum ass
dumn ass
(Don't spend too much time on these alternatives, sperm-for-brains. They all mean the same thing.
Jesus. Dumass.
The physical act between two people expressing their animal voracity and lust, usually consisting of but not limited to: mudplay, garbage tossing (including salad), pillow fights in cholo shorts and ambivalent endings (i.e. shoulder shrugging).
Man... Kim and I got so filthy that it wasn't just fucking, it was straight up dumpster hugging.