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Commonly referred to as CGD, "Cheese Grater Dick" is a painful chafing that occurs as an affect of wearing jeans without underwear.
Chris: I didn't have any clean underwear this morning so I had to go commando today.

Eric: Dude, you are going to have a bad case of Cheese Grater Dick tommorrow
by Chrya Lewa September 21, 2009
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