When a male's ball sack becomes in contact with an area of cold air (less than 32 degrees F), they condense into a thinner package, known as the nut cookie. If a man has more than one ball sack, it becomes a package of nut cookies. If the ballsacks then reach a temperature lower than 10 degrees F, a reaction occurs that results in the formation of a nut cluster.
"Dude, when I was skiing, I forgot my underarmour leggings and baked a nut cookie."
"At least you don't have two ballsacks, I got a wopper of a nut cluster yesterday."