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An extreme fool, of such a level, that their sheer foolism can be compared to Julius Caesar's fame and power.

Foolius Caesars often believe that Julius Caesar invented Caesar salad, and this is one of the main criteria for someone to be called Foolius Caesar.
Bob: That fool thinks that Julius Caesar invented Caesar Salad!

James: Ha, what a Foolius Caesar!
by Wagwanator November 29, 2012
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