When you are jumped by friends or people older than you grab your tighty-whities without notice and put your waist band on a high object like a shower head in the locker room, door nobs, bed posts, coat hangers, ext.
I was jumped in the locker room while wearing tighty-whities in 7th grade and tied up and given a hanging wedgie on a non-working shower head after school. I was left there for an hour before the P.E. teacher finally came in. It sucked.