drop trou Share definition Flag To lower one's pants down to one's ankles, often in a sudden, impulsive manner, thus exposing one's nether regions. We all dropped trou and mooned the old lady. drop trou by Stan B. February 4, 2003 Word of the Day on May 6, 2024 Words you can keep railfan mug chonk mug chud mug based mug 67 mug slime mug mogging mug chopped mug thot mug glazing mug huzz mug yams mug larp mug unc mug cracked mug simp mug baddie mug bop mug lolcow mug