noun. When the going gets weird, the pants go down.
Real citation: "Since you've made a tit of yourself with this latest bit of trou-droppage, you've done nothing but snivel and carry on about some vague, unspecified "rules" you imagine have been violated."
(Nov. 19, 2004, http://groups-beta.google.com/group/alt.flame/msg/9910760f4dc8195e?hl=en&)
Made-up citation: "Tourists should note that the no trou-droppage zone is patrolled by a quartet of postal workers with weed-whackers and drinking problems."