Top Definition
When a bum or hobo takes a bath in a public restroom sink.
Man I walked into the bathroom and there was a smelly bum taking a bum bath in the sink!
by Brandonthedestroyer December 13, 2009
1 more definition
The art of washing your entire vehicle with the sponge/squegee at the gas pump in less time than it takes to fill your gas tank.
Hey watch this. I'll give my truck a Bum Bath before my tank is full.
by Gruteman October 02, 2012

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