Undiefucking 

The act of dry humping in ones undies is called Undiefucking.

John found Audrey undiefucking another man in her fishnet undies.

Undiefucking by Nathan Eastan October 10, 2007

undies 

The undercover law enforcement

Guy 1: who's that creeping
Guy 2: its the undies bro hide the loud

undies by Youngtadoe May 30, 2016

Last Chance Undies 

Your last pair of clean underwear, reminding you that this is your last chance to wear any unless you get your laundry done; that pair of ugly old underwear that you reserve for an emergency.

Dude, I gotta do laundry today, I've got my last chance undies on!

Last Chance Undies by breezy-licious July 17, 2011

undiefudge 

When you shit yo undies. What did you think?

There's undiefudge in my shorts!

undiefudge by Haggerty January 14, 2008

Undie-Tinge 

A Undie-Tinge is when you think you need to fart, but you’re body releases jelly like liquids onto you’re clean underwear.

Oh no! I think I just had a Undie-Tinge!

Undie-Tinge by Shelby Chapstick January 7, 2020

Undie

When you soak a pair of underwear in beer and wring it out into your mouth.

Tyler did an undie on stream.

Undie by shayraypal July 14, 2019

edible undies 

Undergarments that you can eat. The consistancy is similar to fruit roll-ups.

I bought some edible undies, but I got stuck in traffic and ate them in the car.

edible undies by Angelo Da Sinni July 12, 2006