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To have your jewels, testicles, gonads, balls, etc. dangle in the toilet water when attempting to relieve your bowels. Often occurs in the wee hours of the morning in a dark bathroom and bed head is a contributing factor.
when i stumble in the bathroom at O late thirty something in the morning..... and need to cop a squat, only to have someone leave the toilet seat up......

I unexpectedly go "nut dunking"
by whathisnuts June 17, 2009
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When you lean too far forward and your balls hit the cold toilet water.
Objective Man and Gratewon became nutbrothers after discovering they had both experienced nut dunking.
by Gratewon September 25, 2017
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