Top Definition
A phrase used to refer to a friend or someone who has done something good that you like. The phrase is commonly used as a positive reaction to seeing youre friend. It can also be used to announce the presence of your friend at a present location or over a technological device when talking to them.
Guy 1: Yo! Its mah boy!

Guy 2: Oh Shoot! Look its mah boy!

Guy 3: MAH BOYS!!

Guy 1: Yo what up!

Guy 2: its ya boy!

by itsmahboysyo December 24, 2013

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