1400-50;late Middle English: discarded parts of butchered fowls; compared with garbelage the removal of waste from spices (< Anglo-French,Old French; see garble, -age) or Old Frenchgarbage tax on sheaves of grain, though shift of sense, and form in first case, is unclear
1422, originally "giblets of a fowl, waste parts of an animal," later confused with garble in its sense of "siftings, refuse." Many M.E. cookery terms came from Anglo-Fr., so perhaps it is related to O.Fr. jarbage "a bundle of sheaves, entrails," from P.Gmc. *garba-, from PIE *ghrebh- "a handful, a grasp." Sense of "refuse" is first attested 1583. Garbology "study of waste as a social science" is from 1976.