1. To tap that booty so hard your ball sack bounces with intense kinetic energy off of the female's pelvis, anus, or vagina.
2. A word that can be spoken during, or after sex to express the thrusting action of the male and the behavioral characteristics of the ball sack in relation to that action.
dude: "Boutap bitch! You feel that penetration? My balls are bouncin like those 25 cent rubber balls you can get out of those red vending machines at the grocery store next to the checkout lines...bitch."
dude: "Look Mom. My balls are on ice cuz I gave my girlfriend the boutap last night. Geez."