1762, "to massage, rub and percuss the surface of (the body) to restore tone and vigor," from Anglo-Indian shampoo, from Hindi champo, imperative of champna "to press, knead the muscles," perhaps from Sanskrit capayati "pounds, kneads." The thing is thoroughly described in "A Voyage to the East Indies" (1762).
The meaning "lather and wash the hair" is recorded by 1860; extended 1954 to carpets, upholstery, etc. Related: Shampooed; shampooing.
updated on August 03, 2022