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A term used in a boarding school at night after on beds and lights out. If in any case, your dorm is being loud, disruptive or naughty and you hear a teacher coming down the hallway, or you get some form of a vibe that one is coming, you shout this word to alert your dorm that the teacher is coming. It must be said loud enough so that your dorm can hear but quiet enough that the teacher can't hear.
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