Wiktionary
gub
n. (context Scotland slang English) mouth. vb. (context slang English) To defeat.
Wikipedia
Gub
Gub is the second release and first LP by Pigface. It is notable for featuring contributions from Trent Reznor of Nine Inch Nails before Nine Inch Nails achieved mainstream success.
Trent Reznor re-recorded "Suck" for the Nine Inch Nails EP, Broken, released the following year.
Usage examples of "gub".
Anthony Berkeley sponsoring her into the Detection Gub in 1933, and introducing her to the fascinations of witchcraft.
Terry runs in and gubs the bastard n Birrell just starts punchin every cunt.
Paul Guber quit his brokerage firm and entered rabbinical college in Chicago.