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The act of standing with one's legs apart and slowly, while swaying from side to side, rocking your balls back and forth like the pendulum of a grandfather clock.

Boxer shorts are are the preferred style of under-garments for this act of fun manliness.
ME: Any reason you are swaying like that; do you have to Pee?
YOU: Nah, I'm just grandfather clocking...
by andreamaar November 01, 2011
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