The Brief: A "gamer GF" is a girlfriend who plays video games.
The term “gamer gf” is a girlfriend (or potential girlfriend) who is a gamer. This archetype is often fetishized and sexualized in the same way “gamer girls” and “eGirls” are as women who play video games are stereotypically considered to be rare and desirable.
Many people embrace the term gamer girlfriend for themselves or their significant others as it ties their hobby for gaming to love and romance. A gamer boyfriend may have a gamer girlfriend if they are both gamers. Two gamer girlfriends could also be dating each other.