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To sleep. It can also be used as an adjective "schlumphy" to describe the feeling of being extremely tired or sleepy. Can alternatively be spelled schlümph, using the German umlaut above the <u>. Origin: A malapropism formed accidentally in a moment of extreme tiredness, by an American, combing the German word for sleep "schlafen" with the German word for a Smurf, "schlumpf".
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