gob (n.1)

late 13c., "a fragment," from Old French gobet "piece, mouthful," diminutive of gobe "mouthful, lump," related to gober "to gulp, swallow down," probably from Gaulish *gobbo- (compare Irish gob "mouth," Gaelic gob "beak").

1900, perhaps suggested by blob, gob, etc. Also compare glop.