Almost exclusively attributed to females who go out in public having 'forgotten' to put on their underwear, specifically their knickers / panties. It is often suggested that they do this purely to shock or to draw attention to themselves, particularly when exiting cars or deliberately bending over, for publicity or other reasons.

Several celebrities are said to have suffered from this problem on various occasions, in particular Britney Spears, Lindsay Lohan and Paris Hilton.

Underwear amnesia is not to be confused with going commando which is where someone, male or female, deliberately does not wear any underwear as a matter of personal choice for comfort, hygiene or other reasons, the difference being that people going commando will not deliberately seek to draw attention to the fact that they are not wearing underwear.
The movie character Catherine Tramell, played by award-winning actress Sharon Stone in the 1992 movie 'Basic Instinct', famously suffered from underwear amnesia, as we discovered in the leg-crossing scene during her interrogation at the police station.
by rjcoffshore August 10, 2014
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When your underwear is so old, it doesn't need to be thrown away, it just transmogrifies into underwear vapor and floats away.
"Billy's not wearing underwear". "Oh, he was, but it transmogrified into underwear vapor anjd now it's gone.
by The Dr. Bochaciac March 25, 2019
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A symbol for cumming out. You read that correctly, c-u-m-m-i-n-g o-u-t. Beware tho, you may attract an angry Mona and be called homophobic. Mona Lisa may call the police. Bonus points if you wear glasses over the thong on your head. Also, another warning, this may cause extreme orgasms ;)
Hey, have you heard that we're now putting underwear on our heads? Apparently, a side effect of it is getting mobbed by angry Mona Lisas!

How did you cum out to your parents? My friend and I just put underwear on our heads.

S-L-U-T SLUT! LET'S PUT UNDERWEAR ON OUR HEADS!
by chimmyunderwear May 6, 2021
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When you put a pair of undies on someone's head and pull as if you were wedging them.
LOL lets Underwear Head Throttle that dude. You grab the undies, and I'll pull.
by Dookiepoopy September 24, 2023
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April 18 is the national day to send pictures of yourself in only underwear to your boyfriend- especially if his initials are ALM.
“Wow my name is also the name of a river in Asia, and it’s also National Send Underwear Pics to Your Boyfriend Day so I should send a picture of me in underwear to my super cool boyfriend!”
by Riverlover69 April 18, 2022
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clix underwear
clix underwear
by September 4, 2023
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Bang (Christopher) Chan. Bangchan, the leader of K-pop boy group Stray Kids.
Underwear Stain gives me the ick!
by jaylars January 14, 2022
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