A trick perpetrated at summer camps or on fellow military recruits where a tightly made bed (hospital corners and all) is made up in such a way that the sheet(s) below the blanket are made up and tightly tucked in, but they only reach halfway down the mattress before being folded under. thus it is preventing the proper occupant from slipping under covers at bedtime. Rather his legs get stuck halfway down in the folded sheet "envelope."
by CanadianWiz February 02, 2014
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