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to be like a fruitcake, utter foolish insane type behaviour.
fruitcakism is fruit and cake suffixed with ism to mean pure nonsense!!

A collective term for mass stupiditiy.
Charlie Sheen's accused of being 'the vatican warlock assassin..so the media hysteria over what was an in joke between Charlie Sheen and Alex Jones is fruitcakism.
by Burnt-Spider March 05, 2011