Fuck munchies

The feeling of emptiness in one's stomach after one has performed sexually (degree of munchies depends on the level of activity)

Wow Katie, that was awesome...hey, can we get a pizza? I got the fuck munchies

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Post-Fuck Munchies

The extreme hunger you experience right after a fuck session. Also known/abbreviated as PFM.

"Man, that was a hardcore fuck sesh, I have a wicked case of the post-fuck munchies. You want pizza?"