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A term used to pre-warn colleagues of a toilet which you have just had a monster shit in, so that fellow colleagues do not make the mistake of making a visit to the same trap within the "cooldown" period.

Traps are numbered from 1 onwards, from left to right as you face the cubicle.
"Alreet lads, just to give ye' a heads up - trap of the day is #4, she was a beauty!"
by Stim March 26, 2007
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