Anywho is a slang term. It is used to take the place of anyway, however, or anywho in a sentence or conversation. It is a transition word to cue the audience in that you are going to switch topics or revert to speaking about the first thing you were talking about if you have gotten off track for some reason.
People say ' Why! ' at the beginning of a sentence when they are surprised, shocked, or angry. Why, hello, Tom. Why, this is nothing but common vegetable soup. Collins COBUILD Advanced Learner’s Dictionary. Copyright © HarperCollins Publishers.