When you use your well-trained pubococcygeus muscle (the make-your-cock-jump muscle) to give your beloved one an uppercut. Doesn't really enhance sexual gratification, but if you accomplish this feat, you can officially call yourself Iron Crotch.
- I gave her a dick-uppercut and knocked her out cold. She was so amazed when she woke up that she married me and we were happy ever after.
by relevant man April 8, 2008