A pain in the stomach from an immense need to shit. Often used as an excuse to get out of doing things, in a way it's almost like the male version of period pain.

A pubic hair piece. A toupee for the pubic area/genitals. In the 1700’s when mercury was used to treat sexually transmitted diseases (Gonorrhea or Syphilis) one of the side effects was the loss of pubic hair. To disguise this condition, that was not cured by mercury, a Merkin was employed.

A type of mushroom that tastes so much like shit, it causes actual physical pain

Known as coproellis fungi in Latin...

Where you have to poop so bad your crotch hurts

Where you have to take a shot so bad your crotch hurts

If you give a girl (or a guy) an ass rimming, and you've opened their anal cavity so far, what you will have once you are done is a circle of shit around your face and chin. This is whats known as a shitache. (Like a mustache, but made from shit)