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Underwear that you keep in the back of your drawer just in case but they are no longer part of your regular wardrobe. IE they are ugly and your partner doesn't like them.
I have a bunch of underwear tucked away that are shundies because my boyfriend thinks they are too saggy.
Shundies by anw22 May 21, 2013
Some people just wear those shorts that are SO short they might as well be undies… Shundies.
This bloke’s wearing his shundies to play footy.
Shundies by Emija March 27, 2022

shundies in your undies 

A BIG Thank you. I'm so happy i could just shit.
Bob says to Billy, "Yo Billy, i bought us a six pack for the game"... Billy replies "SHUNDIES in your UNDIES" - with the accent on shundies and big ending on the undies!!
shundies in your undies by nat_bob December 11, 2011
People who like music with 'sounds', just as people who like emo like "music with emotion"
I ran into some soundies the other night.
soundies by Kayla-Marie July 3, 2005

slundies 

sexy/slutty underwear selfies
wearing just underwear in a a selfie or for example cuuute panties and a vest top
white boy: daaaaayum girl send me ur slundies ;) ;) ;)

best friend: lets show each other our slundies and check they're okay before you send them to anyone and I'll compliment you a bunch aw aw you're so hot
slundies by damngirlyhyudoinit August 5, 2014
Slang for people who work with sound on film sets and in film production. The lighting counterparts are lampies.
Your batteries died and you forgot to bring extras? Maybe you could score some from the soundies.
Soundies by Agibba February 26, 2017