1. a race around the world, while holding a large piece of poo.
2. a race where two people take a shit; the winner being the first to wipe their arse and reach the other.
Note: not to be confused with poo face (when you smear poo on your face for a pleasurable and/or cosmetic purpose).
TODD: Man, this piece of poo is stuck to my hand!
JOHN: Two of poo, one of me...i make that a poo race!
JOHN: ...I, uh...don't get out much...