User blog comment:IamJakuhoRaikoben/Chapter 354: Ephialtes, Review./@comment-4829046-20131004135205/@comment-4829046-20131004181034

I don't know precisely. There are a few media that use similar joke but I think its something you simply get with common sense, I mean "chick" or "bird" means a Girl or woman figuratively and an Avian literally.