Top Definition
An adorable, black, small, cat/dog like creature that roams the moon at night. They often make noises like "brrr" or "brrrooow" when they want to say hello.
Look at that little Moon Pup!
Moon Pup just brrred at me!
Awww that thing is just so cute, it must be a Moon Pup!
by moonpup July 24, 2010

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