noun
the part of a bikini bottom that rides up above the waistline in the back, resembling the shape of a whale's tail
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The scientist observed the whale tail as it gracefully emerged from the water.
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I couldn't believe how close we were to the whale tail during the boat tour!
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Check out the size of that whale tail, it's massive!
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Her dress had a dramatic train that resembled a whale tail flowing behind her.