also know as plumping. this term is a little more descriptive though. the term is derived from the idea of macking on fat chicks, a.k.a. plumpers. it is also a great american pasttime, much like baseball.
"Hey man, wanna go plumping tonight?"
"What do you mean by plumping?"
"Fat macking man!"
"Oh!!! Of course I wanna go, that's my favorite pasttime."