Sentence:  "I'm n-n-not a tor-tor-tortoise," stuttered the curious creature, "I'm a wha-wha-whang-whang-doodle."/ "A <WSD>whangdoodle</WSD>! What's that?" 
Meaning of the word marked with <WSD> tags:  A whimsical monster in folklore and children's fiction; a bugbear.