-A woman with a dirty vaginal canal. A woman whom after sex, does not shower/douche/clean her area.
-Something your cat makes poops in :]
Jackums: Man, look at her dirty ass pussy!
Johniffer: Yea, is like a litterbox!
Jackums/Johniffer: OH SNAP!
when you do a chick doggy style and shove her face in the litter box while you are doing it
man he litterboxed his ex good last night