Old English hoppian "to spring, leap; to dance; to limp," from Proto-Germanic *hupnojan (source also of Old Norse hoppa "hop, skip," Dutch huppen, German hüpfen "to hop"). Transitive sense from 1791. Related: Hopped; hopping. Hopping-john "stew of bacon with rice and peas" attested from 1838. Hopping mad is from 1670s.