(_!_)      a regular butt

(__!__)    a fat butt

(!)        a tight butt

(_*_)      a sore butt

{_!_}      a swishy butt

(_o_)      an butt that's been around

(_x_)     kiss my butt

(_X_)     leave my butt alone

(_zzz_)    a tired butt

(_o^^o_)   a wise butt

(_E=mc2_)  a smart butt

(_$_)     Money coming out of his butt

(_?_)   Dumb butt

(_#_)  hairy butt