“Slim Shady” is Eminem’s alter ego; the double-personality allows Eminem to pose as an unhinged homicidal lunatic. Stan is writing fan mail to Em, hence the “Dear” at the beginning. In the age before Twitter this was the number one way to reach a celebrity.
Eminem never meant Slim’s words to be taken seriously. Stan’s inability to differentiate between Slim Shady the character and Eminem the artist is a central point in the song; this line is the first hint that Stan doesn’t get it.
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