Top definition
A huge dog that people let get overweight. If it can stand up then nobody will ever break into your house.
Qwerty: "My dad has a friend with a fatty mc fat fat fatty fat dog fat."

Asdf: "Holy shit, can it walk?"

Qwerty: "No, so he has to get carried up the stairs to the house. He's really nice though."
by etaN retsaM March 27, 2008
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