I say, “ Girl they wasn’t kidding like your tubes tied up

from J. Cole – Get Away Lyrics on Rap Genius

When someone gets their tubes tied, they can’t have kids.

“Kidding” means to joke about something… Kinda like “Pulling your leg.” Thus, it is a play on words, the people she heard the rumor from weren’t kidding. And if your tubes are tied, you aren’t “kidding.” Get it?

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