stands for Got Outhealed By A Totem "GOBAT" - Used in World of Warcraft (WoW), when a priest or other such healing class is not healing the party members effectively. Shaman classes has totems that provide a small amount of healing - but shouldn't heal more than healing class. Therefore, if a priest is being outhealed by a totem, s/he's a pretty rotten healer.
Idolization (Shaman): "Priest, I need a heal!"
(Priest gets booted from group)
Kolira (Hunter): "Man, he was a GOBAT - your totems helped me more than him!"