late 14c., mocchen, imitative (cf. crunch), or perhaps from O.Fr. mangier, from L. manducare "to chew." Related: Munched; munching. Munchies "food or snack" is first attested 1959; sense of "craving for food after smoking marijuana" is first attested 1971.
vt. [often confused with mung, q.v.] To transform information in a serial fashion, often requiring large amounts of computation. To trace down a data structure. Related to crunch and nearly synonymous with grovel, but connotes less pain.