A phenomenon which only occurs once an individual wears jeans. It is most commonly used to describe the lump or bulge which forms on the around the zipper/crotch area when sitting down. Any attempt to 'squash' the said
boner may result in making the situation even more awkward, leading most to ignore it and
hope nobody else notices, much like when you pop a real
boner on the train and can't get it to go down.