Most commonly accepted theory: late 19th century macaronic blend of simon (“dollar”), from simon (“sixpence coin”) (17th-century British slang), and Napoleon (“French gold coin worth 20 francs, bearing the image of Napoleon III”). Perhaps from New Orleans. Also see simony.
simoleon (plural simoleons)
- (US, slang) One dollar.
- That'll cost you five simoleons.
- about 1900, O. Henry, Hygeia at the Solito
- "T'ought I was lyin' about the money, did ye? Well, you can frisk me if you wanter. Dat's the last simoleon in the treasury. Who's goin' to pay?"