Top Definition
Nickname for a guy with first name Matt and last name beginning with M-o- (such as Morris, Morrow, etc.), if you have the opportunity to meet a Matty Mo, consider yourself a lucky individual, as these people are often totally badass.
Matty Mo, you are sooo awesome.
-I know, it's what I do.
by Johnny Chimpo45 February 27, 2009

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