(_!_) a regular arse
(__!__) a big, fat arse
(!) a tight arse
(_^^_) a bubble arse
(_*_) a sore arse (aka Winking Red Eye)
{_!_} a squishy arse (aka Trex Between Two Pillows)
(_o_) an arse that's been around a bit (aka Slack Arse)
(_x_) 'kiss my arse!'
(_X_) 'leave my arse alone!'
(_zzz_) a tired arse
(_o^^o_) a wise arse
(_E=mc2_) a smart arse
(_$_) Money coming out of their arse
(_?_) dumb arse