1. A hillbilly term used to define someone undesirable.
2. Also can refer to someone's ass, when covered in shit.
1.
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.
after returning to mexico and having explosive diarehha on the plane when there's no toilet paper. therefore you cannot get a clean wiping of your ass so the mexican pigs have to lick it off.
i had to waddle like a penguin so i wouldnt spread my shit ass around. good thing we had those pigs.