Doody, that's what we call each other, I don't know where it came from

from Eminem (Ft. Obie Trice) – Difficult Lyrics on Rap Genius

Meaning

Eminem and Proof’s nickname for each other was ‘Doody’. Some say it’s because ‘doody’ is another word for ‘shit’ and being ‘the shit’ is to be the best.

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