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late 14c., "heated till it glows red" (of metal, etc.); of persons, "lively, passionate," it is recorded from c.1600. Red-hot mama is 1926, jazz slang, "earthy female singer," also "girlfriend, lover."
Very hot; sizzling •An intensive of all slang senses of hot (1758+)noun phrase
A frankfurter; hot dog (1892+)