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The act of rushing through sex, to the extent of sometimes even faking an orgasm, so one can eat some food when one has the munchies.

Dude, I was so high last night, I totally pump-and-munched with Amber.
by DgA May 02, 2007
A threesome, male female female.
Hey angel, want to join megan and mike for a pump-and-munch?
by Dr Rock June 02, 2006