1. A hillbilly term used to define someone undesirable.
2. Also can refer to someone's ass, when covered in shit.
Jethro: Bill Bob come over here and help me plant some of these Bush for president signs over yander!
Billy Bob: I'm in the union, I'm voting Democratic.
Jethro: Well Shit! Yer nothin' but a shit ass demoncrat!
2. When I crapped my pants at walmart, everyone said I had a shit ass.
When someone (Clint) goes in the bathroom when someone else has to take a dump(PC).
I have to go to the bathroom but Clint just dump blocked the bathroom.
When someone who sits next to you at work and wears the same pants for 5 consecutive days.
Please don't tell me he is wearing his stankpants again!