"a confused mixture," 1660s, from jumble (v.). Jumble-sale is from 1931. The word meaning "type of thin, crisp cake" (1610s) is probably unrelated.
1520s, "to move confusedly" (intransitive), perhaps coined on model of stumble, tumble, etc., and onomatopoeic or felt as suggestive of the action indicated. Transitive meaning "mix in a confused mass" is from 1540s. In 17c. it was yet another euphemism for "have sex with" (a sense first attested 1580s). Related: Jumbled; jumbling.
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