a technique used to subdue, clutch, or hold whatever it is clinging to. Mostly to drain it like a toothpaste tube when it is empty.
Me: Man...I was with this female lastnight, and while we were doing it she said, "do you like this?", and did a pelvic tightening move on my thang. Phew! Next thing you know I was shooting all over the place.
Homie: Oh, she used that ol 'kungfu grip' on you.