litterbug

from WordNet (r) 3.0 (2006)

litterbug
    n 1: a person who litters public places with refuse [syn:
         {litterer}, {litterbug}, {litter lout}]

from The Collaborative International Dictionary of English v.0.48

litterbug \lit"ter*bug`\ (l[i^]t"t[~e]r*b[u^]g), n.
   a person who litters public places with refuse.

   Syn: litterer, litter lout.
        [WordNet 1.5]