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1.
the expression used when someone expresses something you agree with wholeheartedly.
person 1: funnel cake is the best thing ever.
person 2: mah nigga.
by fsdjkgfafdlf November 16, 2011
 
2.
Often used by Rude boys before the grizzly execution of someone, often with a very large gun, the victim often being of african origin
C'mon fool you mah nigga!
by Shaughan April 12, 2005