1) Fictional life form 2) Imaginary creature 
The Whangdoodle is a fanciful creature in folklore and children`s literature, most notably used by British authors Roald Dahl and Julie Andrews. Popularized by a sermon parody attributed to William P. Brannan as `Where the lion roareth and the whangdoodle mourneth for her first-born,` published in The Harp of a Thousand Strings: Or, Laughter fo......
• (n.) An imaginary creature, of undefined character.
Whang'doo`dle noun An imaginary creature, of undefined character. [ Slang]