A rsgf is a term used in the popular online role-playing game, Runescape. It stands for Runescape Girlfriend and usually involves two players in an informal commitment through the means of only the game, and will often not have any real-life connections.
"Yea, I have a girlfriend... In Runescape. It's my rsgf, bro."
by Cman1337 December 27, 2011