I heard a yell the voice sounded familiar
"Give me your girlfriend or I'm gonna kill ya"

from Eminem – Backstabber Lyrics on Rap Genius

Meaning

Shady hears an echo from some other person in jail, that he remembers because he’s said those exact words.

If you listen to the song his voice in this second line sounds a lot like the Christopher Reeve part of Eminem’s “Medicine Ball”

It kind of sounds like Slim Shady’s voice on the Slim Shady EP intro, and My Darling.

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