One of the reasons this phrase has attracted such attention is that it was the first catch-phrase to find currency over the whole of the United States. The skidoo part is no problem - it is thought to be a jocular form of skedaddle . Rather, the question is where the twenty-three came from. I think the question has just been answered. First, unless you are asking for insect information about this word, you have made a common error.
Entomology is the study of insects.
Etymology is the study of the origin of words. Today it means much the same thing. This word has changed little in English over the centuries. In New York sate, there are quite a few of these kills , such as the Homowack kill and the Arthur kill . I've wondered about this for a while.