be a hundred years too early

Calque of Japanese 百年早い (hyaku-nen hayai).

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be a hundred years too early (irregular; see conjugation of "be")

1. (idiomatic, anime and manga fandom slang) To be so immature and unprepared as to have no hope of achieving an accomplishment.

   Don't make me waste my time! You are a hundred years too early to be an opponent worthy of fighting me!