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.
Nickname given to bales of marijuana thrown overboard or out of airplanes. Origin is reportedly from members of the USCoast Guard in the area of Southern Florida.
"Base we've got some square groupers floating outside of Miami harbor."