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1.
Creepy, scary, and/or weird.
"They're creepy and they're kooky,
mysterious and spooky.
They're altogether ooky--
the Addams Family."
by Marc June 09, 2007
 
2.
extremely creepy; also shifty (2) and shady
This guy came up to me in a bar but he was totally ooky, so I gave him a wrong number.
by Miko Monkey May 25, 2005
 
3.
something that is caveman-ish, anything caveman related
dude, that guy wearing a loincloth and carrying a bone is seriously ooky
by deadprez92 January 10, 2007