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gunching is when you felch (anal sex then suck cum out of butthole) then make out with it like its gum.
Jordan and Henry gunch all day!

by you gunch hard November 17, 2010
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The crevice created where the buttock meets the top of the thigh.
There is toilet paper stuck in Shana's guncher.
by Holly Minich February 29, 2004
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