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").

"action of talking," earlier "chatter, loquacity, idle talk" (mid-13c.), also "falsehood, deceit," originally "a gibe, a taunt" (c. 1200), mid-13c., probably from a Scandinavian source akin to Old Norse gabb "mocking, mockery," and in part from Old French gap, gab "joke, jest; bragging talk," which also is probably from Scandinavian (compare gab (v.)). Probably also there is influence from Scottish and northern English gab "the mouth" (see gob (n.2)); OED reports the word "Not in dignified use." Gift of (the) gab "talent for speaking" is from 1680s.