What you get after fucking a
guy in the ass when he hasn't
taken a dump in a few days. A Penis covered in
Poo.
Grandpa (in a pirate voice): arrrrrgggg,
Billy. Me matey. Shiver me anus!
Billy: first mate reporting for duty!
Grandpa: 'tis a fine instrument you got there,
Billy. All hands on the poop deck.
Billy: oh Gramps. Here it comes...
Grandpa: garrrrrrrrrrrrrrrrrrr. That's the stuff.
10 minutes later:
Billy: awwwwww - sick. Grandpa, I have a Poonis.
Grandpa: yarrrr. Gross. Time for a colostomy bag...