From the ArcaMax Publishing, Trivia Newsletter:
http://www.arcamax.com/news/trivia/s-342362-979005
In the beloved comic strip Calvin & Hobbes, the secret club that the imaginative six-year old and his tiger pal had was an acronym for "Get Rid Of Slimy girlS." The club's main purpose seems to have been to keep his nemesis, Suzie Derkins, out of the club.
This news arrived on: 05/02/2008