A British Physical
A British Physical is when the guy sits on the girl's back, she opens her butt like a door, he sticks his hand up her butt, grabs all the goo he can, then slaps it into her snatch like he's trying to murder her with a cheeseburger.
My cousin said it's like a triple scoop of ice cream, but with butt juice and a side of pain.
He did it so hard, the lady screamed like she was being stabbed by a dozen chickens.
My brother tried it and ended up with a face like he'd been hit by a truck.