Akademik

v.

To wear trousers without putting on underwear.

"Comedian Dave Gorman is also firmly with the traditionalists. 'I'm never ever naked beneath my trousers. If God had wanted men to 'go commando' he wouldn't have invented polycotton with two per cent lycra! When my zip broke once I was glad to have boxers on."

— Alison George, "Is your man going commando?," Mail on Sunday, March 18. 2001

Furthermore, colored briefs are 'sleazy' and going without underwear ('going commando,' as they say on campus) is simply gross."

—Jim Spencer, "Marking the Golden Anniversary of a Brief Success," Chicago Tribune, January 22, 1985

I read several reports that claimed today's phrase came from Britain's Royal Marine Commandos who, one assumes, often go boxerless beneath their fatigues. I can't confirm that, but I do know that going commando hit the mainstream when it was used in a 1996 episode of the sitcom Friends. I managed to find a couple of dozen citations since 1996, but I found only one before that

Soldiers on jungle duty "go commando" to reduce the likelihood of fungus infection of the genital region. Hot, humid climates soon cause cotton underwear to be soaked with perspiration, which makes a fertile place for fungi to grow. Trousers that are loose and baggy in the crotch area allow better ventilation to help keep the skin of the crotch dry.