Top definition
A blow job on a really dirty skanky penis. (most likely after a prolonged time without washing like a festival)
Oh man, After a week of camping with no shower at burningman she gave me a Moldy Steamwhistle!

At the end of the festival I got a moldy Steamwhistle from a babe
by Mskorianz September 05, 2012
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Dirty Sanchez Plush

It does not matter how you do it. It's a Fecal Mustache.

Buy the plush