The term DB has two meanings in World of Warcraft. It can either stand for Dragonblight, or Dragon’s Breath. Dragonblight is an area in Northrend in the middle of the continent. Dragon’s Breath is a mage spell that shoots a cone of fire. It is obtained from using talent points in the fire tree. The DB WoW term definition is somewhat rarely used, so not all players will know what you mean.