in. to exit fast; to get out of a place in a hurry. : Go on, scram! Get out of here fast!
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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Word Origin & History
scram
1928, U.S. slang, either a shortened form of scramble (q.v.) or from Ger. schramm, imperative sing. of schrammen "depart."