When someone has anal sex with some ugly bitch and she sucks his dick right after. Later her and some other guy hook up and he kisses her poopy dick mouth, thusly receiving the poop dick mouth.
Puffins are more prone to poop dick mouth than most other animals.

That guy justin got the poop dick mouth

i dont wanna hang out with that lady anymore she got the poop dick mouth
by Mooooop February 1, 2011
Get the Poop Dick Mouth mug.