(humorous) Any word beginning with g that is not normally taboo but is considered to be so in the given context, such asglobalization orgenocide.
2018, Deb Douglas,The Power of Self-Advocacy for Gifted Learners: Teaching the Four Essential Steps to Success (Grades 5–12), Free Spirit Publishing,→ISBN, page42:
And the“g” word (shhh!) is just taboo. Away! Away! They say to gifts Thinking this denial lifts All children to a common place[.]