Fireblast590 Share definition Flag A term for a kid who sits and plays to much online games, as a game called 'runescape' You see that guy over there? He's a fireblast590! Fireblast590 by Dfawwefad January 12, 2008 0 0 Get merch Get the Fireblast590 mug. Buy Now — $32.95 See more merch