When you wear your last chance undies two days in a row because you forgot to do laundry...again. They can be worn either in a normal manner, or inside out to produce a psychological effect as to thinking you actually have clean undies on; Or because you have skid marks and or piss stains.
Nigga to mom "THIS IS AN EMERGENCY! I GOT A DATE AND I HAVE ZOMBIE UNDIES ON B...ITCH!!"
Mom to Nigga "You disgusting fucking pig of a son!! I TAUGHT YOU BETTER! NIGGA!"