gack or gakk

verbiage/slang term among LARPers (generally those of the Camarilla variety) for having a character killed; generally in a severely brutal manner.

"You hear about that Tremere Archon?  He gakked that Birmingham rogue last week and mailed his remains to the dude's sire."

Not necessarily certain of the genesis of the word, but I'd wager it has its origins in onomatopoeia: sounds vaguely akin to a death rattle.