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Derived from "trench foot" - a condition experienced by soldiers during the world wars in "trench warfare".
Also known as chef's arse, an irritating, itchy skin complaint caused by a combination of heat, sweat and tight trousers.
"If I don't get my trench crack sorted soon, it's going to cross the Biffin's bridge and I'll end up with sack rot".
by Patrese December 29, 2007
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