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When a male ballsack slaps the inner thigh. It can usually be done on purpose with the legs spread and producing a swinging motion.

One can do it to another in some cases when the leg is kicked so hard that it acts like the newton pendulum.
“It’s so hot out, this dangling seabiscuit is keeping me cool.”

“Yo, Daniel kicked me so hard, caused a dangling seabiscuit.”
by The CrimsynChan January 18, 2018
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