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1.
A type of retcon (see retroactive continuity) originated by comic book writer Geoff Johns; generally one that renders entire volumes, years or even decades worth of prior comic book stories invalid. These geoffcons can be done without rhyme or reason, seemingly on a writer's whim or stemming from their personal preferences.

A geoffcon differs from your garden variety retcon in that there is little thought put behind your average geoffcon.
"Looks like fifteen years of Emerald Avenger comics just got geoffconned out."
by FatMatt666 January 30, 2009