If only you could see just how lonely and how cold
And frostbit I've become, my back's against the wall
When push come to shove, I just stand up and scream "fuck em all"

from Lil Wayne (Ft. Eminem) – Drop the World Lyrics on Rap Genius

Meaning

Eminem has been going through incredibly tough times and his back is against the wall which means he has no options remaining and all of his problems are piling up on him. But when the final push is coming to push him down, he just brushes them aside and moves on.

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