Noun
(euphemistic) The word gay.
(euphemistic) The word goddamn.
(euphemistic) The word gook.
(humorous) Any word beginning with g that is not normally taboo but is considered to be so in the given context, such as globalization or genocide.
(euphemistic) The word God.
Alternative letter-case form of g-word (“any other word beginning with g”)
Source: en.wiktionary.org