first of all crotch rot is the irritation in your groin region from walkin in hot weather and it forms when your legs and balls rub against eachother.
As Fred was walking out of the ocean the sand and salt that rubbed against his balls and legs caused him to get crotch rot.
by NumBeR OnE GanGSta August 28, 2006
by NumBeR OnE GanGSta August 28, 2006