My dick is so big, if I add another inch to it
You would swear when I raped you that you was actually into it

from Yasiin Bey (Ft. Black Thought & Eminem) – BET 2009 Cypher Lyrics on Rap Genius

Meaning

He has an unusually large penis — large enough that adding any more length to it would cause victims of Em’s rape to retroactively give consent.

It’s also a play on words, he’s saying his dick is so large, if he added another inch to it, you’d be inside it, at the same time, implying you’d be into the rape.

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