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A gross way to talk about a guy's private part, mostly used by black folks who aren't impressed by wiggers.
My cousin said, 'Ma Shit!' when his girlfriend left him for a guy with a bigger one.
At the gym, I heard a guy yell, 'Ma Shit!' after seeing the guy next to him lift 200 pounds.
My homie texted me, 'Bro, that guy's Ma Shit is like a mountain!'