Word origin Trinidad. Buttiwash is the act of a
man licking a woman's ass. Ordinarily, associated with a horny
man so overcome with joy and excitement from getting a beautiful woman with a nice ass in
bed, that he puts his face right on her bare ass.
Nancy to Bob: Hi Bob, whatcha doin buttiwash? I haven't showered in three days.
Bob to
Nancy: Don't worry
honey, I will clean you right up.