"eat hastily," 1960, U.S. teen slang, originally a noun meaning "food, meal" (1932), perhaps imitative, or from scoff
(attested in a similar sense from 1846). Or perhaps from a dial. survival of O.E. sceorfan
"to gnaw, bite" (see scarf
(2)); a similar word is found in a S.African context in the 1600s.