Here goes: 

  (_!_)  a regular ass 

  (__!__)  a fat ass 

  (!)  a tight ass 

  (_._)  a flat ass 

  (_^_)  a bubble ass 

  (_*_)  a sore ass 

  (_!__)  a lop-sided ass 

  {_!_}  a swishy ass 

  (_o_)  an ass that's been around 

  (_O_)  an ass that's been around even more 

  (_x_)  kiss my ass 

  (_X_)  leave my ass alone 

  (_zzz_)  a tired ass 

  (_o^o_)  a wise ass 

  (_13_)  an unlucky ass 

  (_£_)  Money coming out of his ass 

  (_?_)  Dumb ass