Upon waking up with an erection, the act of walking either to the bathroom or laundry room slightly hunched over in order to conceal your erection from your parents or room mates.
Hey Liam, this morning I woke up with a fat boner and had to raptor walk past my parents in the the family room.
When an extremely nerdy kid walks with his hands in front of him like a raptor. He must lean forward and stick two fingers hands out. Raptors creep around corners and are always unexpected.
"Look at that kid, he's a fucking raptor. He's doing the raptor walk."