The often neccessary cleaning of the male rear; often performed with the aid of soap, shampoo, body wash, etc.
I need to do the pre-date butt wash in case Lucy decides to go down on me.
by King Shit January 16, 2003
the act of rubbing one's ass in the face of another, should be a surprise attack, and the receiver of the butt wash should have to struggle to get away and be left with a disgusting taste/smell remaining on their face
My roommate was sitting on the couch the other day, and I got up and gave him the biggest butt wash ever. I even left some shit on his upper lip.
by curbyourskeeter December 08, 2009
like butt-face, butt-head, etc..
That's not the Eiffel tower, buttwash, we're in Tokyo!!
by J-style June 03, 2005