go commando

English

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Going commando

Wikipedia

Verb

go commando

1. (idiomatic, intransitive) To forgo wearing underpants.
   • 1996, Friends (TV series), "The One Where No One's Ready" [3.02], Act 2, approx. 12 minutes (of 23):

     Ross: … why do you have to wear underwear tonight?

     Joey: It's a rented tux, 'kay? I'm not gonna go commando in another man's fatigues.