Casual apparel consisting of a denim covering of the lower body...with a deadly side effect. Basically jeans are the arch nemesis of the weewee, for not even the strongest of ding dong can penetrate through jeans.
Mom: Happy birthday, Rob! Here's your present!
Rob: HOLY SHIT! WEBKINZ! (erection begins, looks down) WOW, WHERE IS IT?
Mom:...under your jeans