Definition 1: The sound a cow makes.
Definition 2: That guy in your friend group who always needs to correct other people's pronunciation of his name. He also almost always flashes himself and his team when he plays Phoenix.
Example 1: The pig goes "oink!" The cow goes "moo." The accountant goes "I'm straight as a ruler!"
Example 2: God, Moo sucks.
A moo has a really used, loose asshole. It’s like putting a hot dog in a paper towel roll
Oberkill: “Wow moos asshole is loose”
Ace: “Yea ik jesus christ”