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1.
In MMOs when you have such a pro healer in your group that they're able to anticipate the damage another character is about to take and initiates a heal before the damage is actually inflicted.

First attributed to Los of Sentinel Guild while pulling massive mob trains in 2Moons.
1. OMFG WHY AM I DEAD?! WHERE WERE THE PREHEALS?! WTFFFFFFFFF!!!!!

2. Yo preheal me dude man bro I'm about to tank this beastly monster over yonder!
by Nzo August 20, 2008