Soiled Seconds

n.--A pair of underwear worn after someone else has already "soiled" them.

v.--Wearing a pair of underwear that has previously been worn by someone else without washing in between

Darren: Hey, bro. I'm all out of clean undies.

Mikael: It's all good, dude. Take mine.

Darren: I don't want your soiled seconds.

Pookie sticks head in: Well, I'll wear 'em...