Let me shit on your chest and if some pee comes out
Just guzzle it down, just guzzle it down

from 50 Cent (Ft. Eminem) – Peep Show Lyrics on Rap Genius

Meaning

It seems as if Eminem is having some, err.. creative sex(?) here. And I think he may have some bladder issues, as I would think he should be able to control whether he pees or not..

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