Kyle Spratt stole Kim Mathers' mobile and wrote down Eminem's number before the phone was returned.
Spratt then called the rapper hoping he would listen to his demo music.
The wannabe rap star recorded the phone conversations and turned them into a song called "Slim Sellout."
He posted them on MySpace.com/kylespratt, but they have since been taken off.
Spratt wrote: "I see the irony in everyones only insult to me as an 'Eminem wannabe' and the fact that i now ripped him .. I don't care if he comes back I dont care if he hears it ... But im almost positive he will ... F*** Eminem."
The contents of the phone calls are not known, but Detroit's WXYZ reports that "they did not turn out well."
For more on Eminem, check out his NME.com page.
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