My middle initial is R for Richard
And my nickname's right on the tip of her tongue

from Slaughterhouse (Ft. Eminem) – Throw That Lyrics on Rap Genius

Meaning

“Dick” is a nickname often given to guys named “Richard” Click Here to see why.

If his nickname which refers to his dick is on the tip of her tongue, that doesn’t just mean she says his name but that she also performs fellatio(oral sex).

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