Just like the munchies you get from being high, this is getting very hungry after having some really good sex.

This mostly happens to guys after a good fucking session. This ensures you sleep well- satisfied x 2 !
Late at night:
"Are there some sandwiches still left in the fridge baby?*
"Yea I gat the Sex Munchies too John, get me some as well."
by Ntee August 11, 2013
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The appetite worked up from having rough, energy-consuming sex.
Damn, you fucked me so hard, I got the sex munchies now.

Or
Okay now that we're done having sex, I'm starving. I totally have the sex munchies.
by Jmtmnt March 3, 2015
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Munchies that you get after having sex, instead of after smoking pot.
One usually goes for high carb snacks, as to replenish after using them all up during intercourse.
Joe: do you have any chips or something?
Jane:Why, we just had sex like 5 minutes ago?
Joe: I have Post-Sex Munchies, I'm starved!
by EMT-chick09 July 19, 2011
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