Saddleslip
The acutely painful taint punch delivered to an unfortunate perineum, that happens after "falling off the top," during intercourse performed in the "Cowgirl" position or any of it's variations. Also occurs as a result of misplacing oneself during a lap dance.
OVERHEARD BACKSTAGE AT THE STRIP CLUB:

Stripper #1; "Oh my god this g-string is fucking killing me tonight."
Stripper #2 "Why?"
Stripper #3 "She 'prolly got a pogoed falling on someone's lap."

Stripper #! "I wish, I was on top last night and took a rugged saddleslip!"