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English word drop trou comes from English trou ((New Zealand, US) trousers. (US) rowing spandex shorts.)
trou (English)
(New Zealand, US) trousers. (US) rowing spandex shorts.
drop trou (English)
(US, intransitive) To drop one's trousers and/or undershorts; to moon. (by extension) to strip, undress, get naked.