1. noun, A timid little dog (however, the phrase has also been used to describe other animals, humans, things, with the characteristics of a wimpy doodle).
2. Proper noun, as in "The Wimpy Doodle". The original wimpy doodle was a nice little poodle named Annie, owned by a family in Pine Hills, Florida.
Your dog is a wimpy doodle. He hides under the bed whenever anyone comes over.