This is a two part move. First, tuck your junk under and back and hold your junk back with your butt cheeks. At this point your slingshot is loaded...now just to find a victim. It's best if you find someone's face. Release the tension on your butt cheeks slingshoting your junk forward. Can be an insult or an offering.
I gave that bitch the "Malaysian Slingshot." Damn near took her eye out.
Engaging in sexual relations with a girl who is so much of a tom-boy that she contains all or part of the male anatomy alongside her female anatomy. While banging this girl you will want to tape or have a close friend hold the ball sack out of the way for maximum pleasure.