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When a woman is being a total wimp and chicken about doing something, someone can roast her with, "Grow a pair of tits and act like a real woman." It comes from the guy version, where they tell each other to grow a pair of balls and stop being such chickens.
My friend said, "You’re gonna let him walk all over you? Grow a pair of tits!"
He told his sister, "Stop being a baby and grow a pair of tits."
She said, "You’re acting like a total wimp. Grow a pair of tits."