to close off a debate with someone suggesting an alternative. Even though there is no factual reason explaing why something is way much better, its undersood by those discussing that by saying way much better there is no need to exlpain why or how or details.
Way much better
Way much better is an adjective a person may use to describe something as superior. It may also be used
Nah, that’s okay, the carwash I go to is way much better.