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A word of which the true meaning is known only by the user. Can be used to describe either a shady event/location/person, or a cool event/location/person. Has also been used to express degrees of confusion.
For example:

Sally: “Jim’s acting sketchy as hell.”

Mary: “What do you mean? That word makes no sense.”
by Tsunami Lu March 19, 2009
Something that just doesn't feel right. If it makes you bob your head side to side, squint, and say, "ehhhhhh", then it's probably sketchy.
"I agree. Yeah, this is totally sketchy."
by angryggggg September 17, 2009
When someone lands a trick on a skateboard awkardly or landing a trick in ruff terain.
Fuck that kickflip was sketchy

Man the stairs look sketchy
by mac me you filthy bitch July 27, 2009
Used to describe a place that is shady, iffy or just generally makes one feel unsafe.

The word was created by a passer-by to describe Vancouver's shady east side and grew like wildfire across the nations.
Going into a poor area that doesn't feel safe is sketchy.
Not down with this guy he is super sketchy.
by TrueSketch June 01, 2009
doing or seeing or accepting something that is borderline perverted
When Tato took Jackson's latin homework to give to me because she knows I stalk him, I felt sketchy
by Molly has a d***mcstergona May 20, 2009
A person who is suspicious
"Mancuso is so sketchy"
by SOOFS October 04, 2008
Meaning poor or cheap looking
woa look at Tamara she's sketchy as
by over5tayer October 16, 2006
The state one tends to be in after the use of hard drugs, usual Extacy. The feeling is one where the mind is awake yet the body feels dead.
Man, I did 2 hits of White Unicorn at WEMF and next day i was sketchy as shit.
by Codpiece July 28, 2003