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1. once you go black you'll never go back
a famous line which means when you get your pussy fucked by a black dick, you're gonna be so loose that you'll never go back to white, asian, latino, etc. dicks
black man: once you go black you'll never go back

white woman: o rly?

black man: ya rly!
2. once you go black you'll never go back
False....yeah.....seriously
Just like 1 being larger than 2, "once you go black you'll never go back" is false.
3. once you go black you'll never go back
Basically once a white woman dates a black man she's never going back to her family because they will disown her.
Jamie: "Hey family look at my new boyfriend!"
Family: "wtf get that shit out of our house once you go black you'll never go back... to your family!"
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