A popular phrase used in numerous World of Warcraft servers as means to challenge someone to a 5 versus 5 Player versus Player deathmatch. The phrase quickly became a common term in flame wars and trash talking on the public World of Warcraft forums between various guilds trying to establish who's stronger.
Guild 1: You guys are having problems with Magmadar? That's pretty bad...
Guild 2: It's not like you're doing much better.
Guild 1: Better than you that's for sure...
Guild 2: Oh yeah? Got 5?