1. Ignore it for as long as possible.
  2. Wear athletic/compression shorts and pretend like it's actual underwear.
  3. Ask to borrow a roommate or sibling's pair of underwear.
  4. Borrow a roommate or sibling's underwear without asking.
  5. Grab a pair of old underwear from the mess on your floor, convince yourself that they're not that dirty, and wear those until you feel morally reprehensible.
  6. Buy new underwear until you run out again.
  7. Free ball it.
  8. Do your laundry.