Slim shady is to Eminem as Mr. Hyde is to Dr. Jeckle.
In his song Eminem commonly talks about 'Slim" as all his bad qualities, and the cause of all his problems. He actually kills him of in the song "Mockingbird". After Eminem kills him, everything gets better.
I turn around, find a gun on the ground. Cock it, put it to my head and scream "Die shady" and pop it. - When I'm gone

He killed "Slim shady", his alter ego.
by I_Broke_It May 26, 2011
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A tightly rolled, long joint composed exclusively of high quality weed (no tobacco).
Let's burn a Slim Shady before that lame ass party tonight.
by Rajeeb April 10, 2007
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Eminem's (former) alter-ego, until he got clean like 2 years ago, now he's coming up with some pretty shitty songs. He was better before he got clean.
Me: What's your favorite song by Eminem?

Other guy: Not Afraid. That shit is AWESOME!

Me: Fuck you. Stan is WAAAAAY better. I miss the Slim Shady days.
by DarkNite1111 November 11, 2010
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The name Marshall Matthers used (past tense) when he wrote song under the influence of drugs, unlike his present-day crap.

aka

His name when he actually wrote good music before this whole Recovery bullshit.
1. Do you listen to Slim Shady?

2. Yeah he's awesome!

1. Recovery is a great album!

2. false, recovery is not slim shady, the eminem show and his early shit is slim shady
by AnAngryShadyFan November 7, 2010
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Nickname for Eminem that he uses many times in his songs ex; My name is. Commonly used as his alter-ego.
Hi!
My name is
What?
My name is
Who?
My name is
Chika-chika
Slim Shady
by The R7 March 15, 2022
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The coolest man on the face of the earth and no one else can say otherwise
Woah that person is so cool! It must be slim shady
by EminemIsTheReal May 31, 2021
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