“Rude Boy” is the title to a popular Rihanna song and the line “…I Rihanna that vagina…” is a reference to the violent incident between her and her ex, Chris Brown. Chris Brown “beat up” Rihanna. The phrase “beat up” or “beat it up” is also used when describing how aggressively a guy fucks a girl or a girls vagina. In essence, whats being said is that Childish “beat up that vagina” or fucked the shit out of a girl.
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