Top Definition
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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