When your pupic hairs, usually around the taint, tie themselves in a knot while walking or engaging in other physical activities.
I ran 15 miles yesterday, at around mile 8, I noticed a sharp pain in the nether regions. It was a crotch knot.
by atwig January 03, 2015
He punched me in my crotch knot.
by gaysensualist May 16, 2012