Top Definition
When one man shits on his friends grundle while his friend simultaneously cums on the shitters grundle. Then they proceed to scissor each other. YUM. Then their third friend eats the delicous, gooey morsel.
Jeffery loves a nice steamy Grundle Smore compliments of Fred and Larry.

FUCK! That was one tasty Grundle Smore.
by Colonel Rumple Foreskin March 23, 2011
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