lackluster automobile

My son B and I were trading creative insults the other day for laughs. We had some good ones like, “you are the little hole in the ground you don’t see until you twist your ankle”, or “you are that little piece of plastic wrap that you can’t throw away because the static cling keeps is stuck to your finger.” In the end he won hands down with “You lackluster automobile.” I may be a biased parent, but I think that was a brilliant way to sum up so many subtle ideas and feelings in two short words.