The act of running towards someone smaller than you, thrusting your full body weight onto them, and causing them to be lying flat on the ground with you laying flat on top of them after impact. Your bodies create the illusion of a short stack.
"Dude, did you see what she did to Evan?"
"Yeah, she totally pancaked him. He's still just laying there on the floor. Do you think he'll be alright?"
"I don't know. That pancaking was pretty hard core."
"Yeah it was."