An act of "beating the meat" by standing up, with the palm holding the dick from the side (as opposed to from the bottom), not unlike the handle of a spatula, and at the time of climax, jerking said meat skywards, thus causing the "burger" to flip.
Dude: So how was your lonely night in then bro?
Bro: Dude, I got some mickey d's and some back door sluts 9. Man, I was flipping burgers all night SON!!