This is the seventh pair of leggings you've had to throw away because everyone can see your butt.
You'll need a few things besides your best pair of crappy leggings:
Your second best pair of crappy leggings
Cushion stuffing, $7.15
1. Sew the ankles on your crappy leggings shut.
2. Stuff your crappy leggings full of cushion stuffing ($7.15).
3. Roll the top like a bag of chips and pin it shut so that you can sew it closed.