gob (n.1) Look up gob at Dictionary.com
"a mouthful, lump," late 14c., from gobbet.
gob (n.2) Look up gob at Dictionary.com
"mouth," 1540s, from Irish gob "mouth," and thus related to the other English noun gob (also see gobbet). Gob-stopper "type of large hard candy" is from 1928.