And if I'm coming off brash please forgive me
But, that's all I want

from Slaughterhouse (Ft. Eminem & Skylar) – Our House Lyrics 1 on Rap Genius

He wants to be the best of all times, by any possible mean, so he asks for forgiveness if you found his used mean careless (garish). (Remember that he first came off by dissing pretty much everybody).

That’s if he’s addressing you the listener, this could also ask God for forgiveness on how his wish came off. (In this sense, questionning God’s listening before wishing is kind of brash).

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