(n.) A person who instantly catches your attention, who is dressed in outlandish clothing, or acting out in an awkward way,or just plain freakish.
Basically a cross between a wacko and a noodle?...
A person who walks around in a banana costumemay be considered a wakadoodle.
(adj.) Anything beyond whacky. Usually a one word exclamation of shock in response to the observed whackiness.
(n.) A person displaying whacky behavior.
A paranoid conspiracy nut, usually on the right wing of the political spectrum.
Those whackadoodles at the tea partyrally were convinced that extending unemployment benefits was a plot perpetrated by the socialist puppetmasters of the U.N.