(n) The worship of guns; a modern religion based on buying, owning, carrying and shooting large numbers of firearms in situations where they are not really necessary.
Gundamentalism promises to free you from the meaninglessness of everyday life by letting you stroke long hard objects and make loud noises while fantasizing about killing your enemies.Also:
UPDATED August 8, 2013:
Hooray! "Guntamentalism" has been accepted by The Urban Dictionary. Go vote it up!
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I found several earlier references to the term. What a pity they didn't enter it into the dictionary: