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1.
1. Of or relating to the ass or the region thereabout.

2. Acting, smelling, tasting, looking, feeling, or sounding in a manner that resembles that of an ass, or very badly.
God damn! This diet Coke tastes assful.
by Tenkin October 17, 2003
 
2.
a lot -- or just way too much
I had an assful of him the other day, I need to get out of here
by california April 27, 2002
 
3.
one who is assy
"That bumscummin' bitch over there sure is assful."
"What'd you say 'bout my mum?"
by Bastardized Bottomburp March 22, 2003