a. A person that is so involved in drugs, alcohol, sex, and general debauchery above what is conceiveably possible.
b. A shady character.
c. Someone that appears to have no moral judgment, self-respect, or general hygiene to the point where he/she is a total laughingstock that must be avoided.
Holy crap man, he lives in Roxbury, obviously hes a sketchball.

She dumped him and went out with two other guys on the same day? Holy sketchball, batman!
by Rooster October 25, 2003
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a.) The noun form of sketchy.
b.) Someone who participates in activities that you wouldn't want the majority of people to know about because people will think you're creepy, and avoid you.

Normal behavior of a sketchball include:
Hitting on girls outside of preppy suburban bars.
Sitting by themselves at night on their sidekick/blackberry
"Accidently" sleeping with people
Lurking people like crazy on facebook/myspace/AIM.
Man, Wesley is such a sketchball, he was lurking that girls myspace at the show, while SHE was at the show, somehow he ended up "accidently" sleeping with her, after he hit on her friend last night.
by ChristineOhhh May 27, 2007
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a guy was lurking behind a building by himself at 3 am. What a sketchball!
by Ellie September 26, 2003
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VERB: containing the attributes of being sketchy.
1. A 5 foot 8, 175 pound guy who says he was going to be an outside linebacker for Penn State.

2. A guy who says he's unemployed because he has a lot of money and he wants a girl to like him for who he is.
by Jennie R. June 29, 2005
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This activity occurs when you are in public and you see a police officer. The game goes as followed.
1. Spot a police officer or someone in law enforcement.
2. Look at him/her and make sure he/she sees you clearly.
3. Run as fast as you can in the opposite direction.
4. Results may vary.
A. Wanna play sketchball?
B. What's that?
A. It's awesome.
by stevemasterofallthings July 11, 2008
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Someone who in the presence of other people makes them feel uncomfortable or weirded out. In some cases such acts will result in the "non-sketchball" to physically or verbally abuse the sketchball"
"It wasnt even a dotch"
-TYLER MARSHALL
"Yo Marshall quit being a sketchball"
"Marshall quit sketchin out"
"Marshall why are you a sketchball"
by Sketchball December 17, 2006
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