The act of practicing for a blumpkin by jerking yourself off while taking a dump.
I tried to give myself a jerumpkin as practice before my girl gave me a blumpkin.
by Antler* February 29, 2008
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A poop stain on the back of the terlet(toilet)seat that is left after sitting too far back while performing a jerumpkin.
After finishing a very satisfying jerumpkin, I got up turned around and noticed jerumpkin shrapnel on the terlet seat.
by Antler* February 29, 2008
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