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An overhaul to the traditional blumpkin, in which the receiver of the oral sex is performing an upper-decker (Shitting in the tank of the toilet). While the other participating member is straddling the toilets lower bowl A.C. Slater style, taking a shit while servicing the other.
She promised to give me a mount saint blumpkin if I agreed to watch twilight.

I've been watching a lot of "saved by the bell" lately, it's really got me craving a mount saint blumpkin.
by Clarence Carter be Strokin August 08, 2011
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