Definition of "Gog"

Gog and Magog, a figure (or two figures) mentioned in the Hebrew Bible in Ezekiel 38 and 39, and variously identified by later writers with Satan or certain hostile nations. (See Revelation 20:8.)  examples

(obsolete) Replacement for the word God when swearing, forming vulgar minced oaths originating in the 14th century: by Gog’s wounds, Gog’s bread...  quotations

(UK, slang) Synonym of North Walian: a person from North Wales.