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
#mouldy steamwhistle #moldy steam whistle #moldy steemwhistle #blow job #bj
Mskorianz tarafından 5 Eylül 2012, Çarşamba
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