Kangaroo Pouch
When you fist a chick and start thrusting the arm in and out so hard that she starts to hop around like a kangaroo. After a good 7:53 seconds (time may vary) you take out your arm, leaving the vagina flabby, resembling a kangaroo pouch.
Bobby- Hey Joey see that chick hopping everywhere.
Joey- Yeah, what the fuck is wrong with her?
Bobby- Thats what a "Kangaroo Pouch" does to you.