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Generally meaning someone who is mysterious or difficult to understand; someone who tends to stay in the background.

Can also be used more offensively to describe someone who is or seems to be untrustworthy, sneaky and unrespectable.
I want to get to know him, but he's so shady, it will take some time.

I don't trust her, she seems really shady.

by Kurtney October 19, 2007
Something that is suspicious, questionable, unsafe, low quality;In regards to people its someone who doesnt keep it real, or acts mysteriously.
J-Red: Everything in the Quad City Mallards ice arena is shady.
Alex: I completely agree with you 100%!!!
by qwerty77 March 28, 2007
A place you don't want to be. This place may exhibit any combination of the following characteristics:

1. a high crime rate
2. a plethora of sketchy characters (aka thugs)
3. dark alleys or blind corners
4. the presence of metal detectors or rent-a-cops
5. instills a fear of you gettin' jacked

Ladies, if you have to ask a guy to walk you to your car for safety reasons (and not because you want to make out with him) ... the place is definitely shady.
I don't care that parking garage has decent lighting, it is shady from midnight to 6 am. Why else would they need a rent-a-cop?

The G-bar over in downtown is shady. Even my buddy Ian, who's pretty much a thug, got jacked there.

Ken went to a shady high school.
Really, how shady?
So shady they put metal detectors at the doors his freshmen year.
by PtotheJ January 01, 2008
1. Suspicious looking
2. Short for Slim Shady aka Eminem
3. Clothing line founded by Eminem
1. That musta looked mad shady when I walked up to Chris at work, handed him $20, then left.
2. Slim Shady is the only respectable white rapper.
3. That Shady hoodie was $80.
by deeee May 19, 2004
Short reference to Slim Shady, aka Eminem, aka Marshall Mathers.
''look dawg, Shady's on TV''
by Brendan April 07, 2003
a girl who you call up at the end of the night(bootycall) that is most likely not attractve and you dont want anyone to find out about it
pullin a shady tonight
by dylancamtim December 29, 2010
Mrshall Mathers, Eminem

n. an Academy Award and Grammy Award-winning American rapper, record producer and actor. Having sold over seventy million albums worldwide, Eminem is one of the highest-selling rappers of all time.
Yo u heard that new Shady junt? Dude spits like a tommy.
by Keylo November 02, 2008