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From No Game No life (Anime)
Context: this gamer guy is pretty pissed that his sister is falling asleep and afraid that he's gonna die in the game, but then he gets hyped and says:
やったろうじゃねえか!
From what I can gather, じゃねえか is a colloquial form of じゃないか, but what is やったろう and how come it can att...