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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the alter ego of marshall mathers. Slim is the villainous version of eminem, and completes tasks that em would like to do.
"In this corner, weighing 175 pounds, with a record of 17 rapes, 400 assaults, and 4 murders, the undisputed, most diabolical villain in the world, slim shady!" -Crack a Bottle.
by tgrizzle9er November 23, 2009

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Slim Shady is the alter ego of Detroit rapper Eminem. Slim Shady is the evil and mischievous side of Eminem. He was created by Em when he and some guys got together to make a rap group with the 12 best rappers in Detroit. It was called D12, or the Dirty Dozen. Since there were supposed to be 12 people and they only had six, they all came up with alter egos so there would be 12 members and Slim Shady was born. Eminem often raps through the point of view of Slim. He was not created in Em's first album Infinite and did not appear in his 2010 album Recovery. In the Slim Shady LP Slim was a childish drug dealer, drug taker, immortal, murdering, raping scumbag. He made a lot of jokes and did a good bit of horrible mischeivious things. The tone was still joking though. In the Marshall Mathers LP he did more horrible stuff, including some material about rape and serial killing along with more gang, drug, and violent activity. He was less pronounced on the Eminem Show and Encore as Em mostly rapped about being Eminem, but Shady was mentioned. Slim met his darkest days on Relapse, where he became a psychotic rapist and serial killer for most songs, going into detail about raping and killing women in horrible ways and at times being a gay serial killer who kills and eats men and sometimes does things such as aborting babies. There was some Slim Shady content in the MMLP2, but he was less pronounced.
Ex. 1- Would the real Slim Shady please stand up?
Ex. 2- Oh shit Slim Shady is coming, he just raped and killed my wife and now he's coming for me and my daughters.
Ex. 3- Slim Shady is the dopest motherfucker out there.
by Seiclone37 January 24, 2015

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1. A psychopathic human being who has no feelings for anyone or anything. Sent by the devil, he brutally mutilates his victims, rapes victims, and abuses family members. Has a reputation for not caring .

2. An altar ego to American rapper Eminem. Eminem uses Slim Shady as an excuse for why he says or does things. He is an evil twin if you'd like.
1. Damn, that fucking guy was going Slim Shady on our neighbourhood last week.

2. "That's why they call me Slim Shady, I'm back"
by Marcus1296 October 12, 2014

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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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slang for a real angry white dude.

comes from eminem's angry alter ego, slim shady.
relax slim shady.
by notanangrywhiteguy September 04, 2009

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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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