similar to 'shit a brick', when something so scary happens or when something makes you really nervous
the cops dog kept sniffing our bag in the airport, that was such a 'brown trouser moment'
by Shadzame September 24, 2008
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A point in time where one would be left with a proverbial (and occasionally literal) brick in the seat of their trousers.
"Hey, you know that one scene in Band of Brothers, in Bastogne, at the end of the artillery barrage, where Luz and Lipton have a dud shell hit about three feet away?"

"Now that's a brown pants moment if i ever saw one"
by SlavosaurusBlyat December 6, 2016
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The feeling of your anal sphincter tightening as you are confronted by an unexpected and terrible result, that might be your fault. As in a change of color as a result of fecal matter being involuntarily excreted.
As all of the lights in the building went out at once, following Private Snuffy's flip of the switch, he experienced a browning moment, before they flickered back on amidst the sergeant's grumbling about the crappy electrical system at Camp Blunderfudge.
by dsmartas January 28, 2020
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