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"to plop one out" is slang for "to give birth." it is often used when making fun of the birth-giving process.
Pa, I just plopped another one out? Where can I put it?

SUE ANN, HOW MANY TIMES DID I TELL YOU NOT TO PLOP ONE OUT WHEN COMPANY IS OVER?
by Mofo Egg Salad November 15, 2006
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