When used in World of Warcraft, pull can mean one of two things. “Go pull those monsters” means attack or walk near enemies that have not been engaged so that they will attack you. Generally enemies are pulled back away from where they were so that they can be fought without other nearby enemies joining the battle. While in an instance or raid, pulling is usually done by the tank or by a hunter using Misdirect.
The second meaning of pull is related to threat. “Pulling off the tank” means generating more threat than the tank (110% for melee, 130% for ranged) so that the enemy attacks you instead of the tank. Most players know one or both meanings of the pull WoW term definition.