Definition of exodia:
(n) :
An invincible creature from the Yu-Gi-Oh! manga and trading card game which is summoned by assembling its five parts (head, right and left arm, right and left leg), whereby the game is automatically won.
(n) :
(transferred sense, Internet slang, gaming) A perfect, powerful or almighty assembly.
(n) :
(transferred sense, Internet slang) An entity that combines all properties of an idea or type in itself; a perfect example; an embodiment.
(adj) :
(Internet slang, gaming) Perfectly assembled or composed and thus invincible.