You throwin' your piece up
Is a waste of fake like a phony B-cup

from Royce Da 5'9" (Ft. Eminem) – Writer's Block Lyrics on Rap Genius

Meaning

B-sized breasts, aren’t that great anyway, and FAKE ones are just pointless… Just like you flashing your piece at Royce.

Might as well go all the way to double Dee’s if you’re gonna fake it

(Or double F’s in this case…)

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