I got that mad dick, you know it always nut up

from Big Sean – Dance (A$$) Lyrics on Rap Genius


People “nut up” when they get mad, they get all tough, or, in slang, “grow a pair” — giving in to their instinctive testosterone-induced habits: getting angry.

And when people are mad, they are often referred to as going nuts and being crazy, so he’s saying he’s got that mad dick that’s always crazy.

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