(often humorous) A whimsical monster in folklore and children's fiction; a bugbear.
(obsolete) Term of disparagement
For a man who can listen for an hour to Mr. White, the whining, nasal, Whangdoodle preacher, and then sit down and write, without shedding melancholy from his pen as water slides from a duck's back, is more than mortal.
"Now, Ben, you're a lawyer. You don't give a whang-doodle about anything mechanical."
(poker) A ruling in which the opening stake limits are doubled for the next play after the appearance of a very good hand.