(_!_) a regular "nice" ass
(__!__) a large ass (also spelled 'lard')
(!) a tight ass
(_._) a flat ass
(_^_) a bubbly ass
(_*_) a sore ass
(_!__) a lop-sided ass
{_!_} a squishy ass
(_o_) an ass that's been around
(_O_) and more....
(_x_) kiss my ass
(_X_) "Get off my ass."
(_zzz_) a tired ass
(_o^o_) a wise ass
(_13_) an unlucky ass
(_?_) dumb ass