Slang: synonomous with asshole. Mainly because a normal tight sphincter resembles the inside of a knot made on a baloon.
Hey ... last night I popped her right in the baloon knot.
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Noun: slang for anus. Just look at an inside out baloon and you will understand.
My dog must have worms because he is dragging his baloon knot across the floor!
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An asshole... a tied baloon looks like the human asshole.
My woman has a tight brown baloon knot.
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