Yeah I guess life is a bitch ain't it Tip? And each one thinks they the shit
Shirt off my back?

from T.I. (Ft. Eminem) – That's All She Wrote (Alternate Eminem Verse) Lyrics on Rap Genius

Meaning

Eminem and T.I have both gone through tough obstacles in life.
Eminem says that he almost died do to an overdose and T.I. was locked up twice

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