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Underpants (usually of a female). Originally an Australian slang term, Americans are finally picking it up due to the word ‘panties’ being creepy AF.
“My undies are riding up my bum.”
Undies by HeeGee January 14, 2021

Hundies for the undies

Hundred dollar bills stuffed in yo panties
At the strip club, Dave put some hundies for the undies in that G string!
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!
Word of the Day on July 20, 2011

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.

Dirty Undies 

Noun, plural. Undergraduate students at a college or university.
The frat-house dirty undies are typically the loudest and stinkiest lot on any college campus.