An unnecessary increase in air volume within the cheeks before doing an extreme sports trick. Much like a chipmunk.
Bro, did you see that guy do a massive face pump before throwing that backflip." "Yeah, dude.
by wilslost July 18, 2010
The act of pumping someone's face full of your cock. A blowjob.
Yo dude, did you facepump her or what?
by Shlomo Guzas December 01, 2004