I'm the shit
Why you think Proof used to call me Doodie?

from Eminem (Ft. Pink) – Won't Back Down Lyrics on Rap Genius

Meaning

“I’m the shit” is an expression meaning “I’m the best”, but taken literally it means “I’m the poop”

“Doodie” is slang for poop, and is also the nickname late rapper and close friend Proof used to call Eminem

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