Top Definition
The dark and evil counterpart of Samurai Jack. He only appeared in one episode called ''Jack VS Mad Jack''. Mad Jack is a badass, a samurai, an illusion, a clone and a master of all fighting skills. He is also mysterious and rowdy.
Mad Jack is cool but he's so angry
by CollectorofSouls November 11, 2014
1 more definition
A person that is a brony.
That guy is obviosly a madjack.
by Anonamos February 19, 2013

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