n. a dollar. (Underworld.) : For only one simoleon, you get a ticket to the greatest show on earth.
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
simoleon
slang for "a dollar," 1895, Amer.Eng., of unknown origin; related sambolio is attested from 1886.