sweater boner
when you are sitting down and a piece of clothing (i.e a sweater or sweat pants) makes it appear that you have an erection
guy one: oh shit man
guy two: what?
guy one: i got a major sweater boner.(pulls on sweater) i hope no one noticed
guy two: what?
guy one: i got a major sweater boner.(pulls on sweater) i hope no one noticed