After listening to this song a few times. I think its mainly going at the haters. The people who say that wayne aint got skill, he talkin bout climbin to the top but their aint no room for him. Which I think means that too many people have their fav rapper already locked in and don't give no one a chance, so hes sayin "all this bullshit made me strong motherfucka" and I think em just gives it to us plain and simple, he saying when he goes all out and gives it his all that he his hands down the best. No question. He proved it with this verse, wordplay, switchin up flows, multi-syllable rhymes, and confidence and swag thru the roof. He also talking bout how when he first came out people took him as a joke and just a funny semi-talented white rapper that dre is taking a chance on. But no one saw what he had coming, like when he said, "i came up from behind and pretty much buttf***ed this game up" I think that means he started all the way at the bottom, not sellin too many copies on his first album (bout 283, 000). T. I only sold 163, 000 copies in the us on his debut album. Now eminem's relapse sold more than 5 mil worldwide. He also talking about how he aint come in the game for the fame. He wants to prove to everyone that he is on top, and not falling off anytime soon.