Somebody dropped me on my head, and I'm for sure
That my mother did it, but the bitch won't admit it was her
I slit her stomach open with a scalpel when she was six months

from Eminem – Any Man Lyrics on Rap Genius

Meaning

Eminem blames his craziness on head trauma that his mom caused when he was younger.

As you are probably aware of, Eminem has a somewhat conflicted relationship with his mother (see this line on “My Name Is”)

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