drop your trousers

drop (one's) trousers

To lower one's pants, typically in a public setting. I know you're drunk, but you can't drop your trousers out here! The doctor asked me to drop my trousers so he could give me the shot.
See also: drop, trouser
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

drop your trousers

deliberately let your trousers fall down, especially in a public place.
See also: drop, trouser
Farlex Partner Idioms Dictionary © Farlex 2017
See also:
References in periodicals archive ?
"If you think you can give us a leg up then drop your trousers at Holy Trinity Church Hall on Sunday, March 11, between 2pm and 4.30pm."
In a Bangkok dry cleaner's: "Drop your trousers here for best results."