Someone who plays a multiplayer video game and refuses to use any weapons/characters/skills that aren't considered "meta."
Although someone who uses the meta can be someone who simply enjoys using the most reliable tactics available, "Metaslave" is used to describe someone who sees anyone who doesn't use the meta as an idiot or noob and may even berate those who refuse to comply with their demands.
Originated from League of Legends to describe someone who uses an overpowered champion in order to climb up the competitive ranks.
"Hey, why did Todd get banned from the community server?"
"He kept yelling at this dude for using a machine gun instead of an SMG. He was promptly called a Metaslave then perma-banned."
myspace for cats, where cats get myspaces to find cat friends
Cat on MySpace1: meow how are you, have a purrrfect day!
Cat on MySpace2: oh i am doing just fine my furry furriend! i hope you get a lot of catnip today!