(Verb) To eat an inhuman amount of nourishment and then justify the act by exercising as much as an animal, such as a fish.
Alternatedefinition: The act of being caught performing something illegal, such as smoking marijuana.
Man's Friend: Holy... Wow. How can you eat 17 extra large pizzas and 8 boxes of breadsticks?
Man: Don't worry, I'm gonna Michael Phelps it.
Man's Firend: What?
Man's: Nothing. I'll see you later. I'm gonna run around the... Moon.
Michael Phelps Syndrome, or MPS for short, is an affliction whereby females mistakenly believe that a male is attractive based on his accomplishments or social status, despite his hideous appearance.
Jenna: Wow, Michael Phelps is so hot.
Jane: No, you're just blinded his eight gold medals.
Jenna: But he's so cute.
Jane: Are you kidding? He looks like a retarded fish. You've clearly got Michael Phelps Syndrome.