Encyclopaedia WoDica

Encyclopaedia WODica, p.n., WOD-ism a player obsessed with the details of White Wolf's World of Darkness as described in countless supplements; said player is always willing to regale other players with knowledge from their storehouse of arcane WOD lore, whether it's appropriate or not.
Ex: "Um, did you hear what Steve's doing? Encyclopaedia WODica over there is telling the other players how the Ravnos antediluvian got nuked by the Technocracy -- that's out-of-character knowledge!" See also Cammie Lawyer. [GJ1]
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Addendum: The old WoD isn't the only game that has this sort of slavish devotion to the rules. Deadlands and Shadowrun are just two more examples of games with massive metaplot and years of supplements to remember.