Newish here, what exactly did grimmstar do?

[AHMWM]

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Could somebody please explain where this famous phrase "Grimstarr rocks the Grimstarr" comes from?

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I believe it came from a thread where a mod gave a custom title to the person with the best diss freestyle on grim.. The hook had to be Grimstarr Rocks the Grimstarr...there might be more of a meaning though I'm not sure.....

P.S.-don't forget about his legendary bad acne