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1.
A threesome, male female female.
Hey angel, want to join megan and mike for a pump-and-munch?
by Dr Rock June 02, 2006
 
2.
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