from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Slang A person regarded as being very strange or eccentric.
- n. Slang A deranged, potentially dangerous person.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A strange, odd, eccentric person.
- n. An insane, possibly dangerous person.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. someone deranged and possibly dangerous
- n. someone unpleasantly strange or eccentric
From weird + -o. (Wiktionary)