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.”
by HeeGee January 14, 2021
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High school underclassmen (especially freshmen and sophomores).
I got shoved by an undie in the hallway today so I schooled 'im!

The undies in my photography class thought I was a freshman -_-
by Ello the band geek December 18, 2009
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Unresolved Daddy Issues. When a female has received inadequate or inappropriate attention from the father-figure in her life leading her to seek male approval elsewhere through sex or a romantic relationship, usually from an older man.

That chick has some whack undies, her father really messed her head up.

(I'm not sure why this was rejected the first time, it seems to fit all the editing criteria, please reconsider).
by jpc1 April 22, 2009
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Short for "Undesirables". These are people whom you do NOT want to see at a bar/club.
Girl you need to make sure you leave your dirty undies at home!
by dpero March 6, 2008
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The undercover law enforcement
Guy 1: who's that creeping
Guy 2: its the undies bro hide the loud
by Youngtadoe May 30, 2016
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When you soak a pair of underwear in beer and wring it out into your mouth.
Tyler did an undie on stream.
by shayraypal July 14, 2019
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A piece of underwear, though usually used in plural.
Oh dear, I don't appear to be wearing any undies.
by GDisCorrupt September 5, 2007
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