- (noun) Slang A person regarded as eccentric or irrational: "a catchy pop portrait of a wacko who talks to himself in French” ( Phoebe Hoban).
- (adjective) mad or eccentric
- (noun) a mad or eccentric person
"Looked at sufficiently askew (some might prefer the term wacko), everything is new under the sun."
"Get real this wacko is here to stay, afterall he is a Republican and that in itself makes him royalty ... just ask him."
"This dumb wacko is heading down the road to terrible change."
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