by Yanks November 17, 2004
A girl with diarrhea that's getting fucked in the ass then has a massive explosion that escapes under pressure around your dick.
Dude I was poundin your mom's ass when she let out a rusty steamwhistle and shouted "Quittin' Time Son!"
by Rusty Posse December 29, 2010
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
At the end of the festival I got a moldy Steamwhistle from a babe
by Mskorianz September 05, 2012
by BigBuddha76 November 29, 2015