The phrase "fantastic way" is an adjective phrase used to describe something in a positive and enthusiastic manner. It implies that what ever it refers to, was done or experienced in an exceptional, imaginative, and impressive fashion. The word "fantastic" means extraordinary or incredible, so when used as an adverb, it describes how something is done, while when used as an adjective, it describes the quality of what has been done. In this case, using the phrase "fantastic way" to describe a particular action would mean that it was executed in such a manner that it left people amazed and impressed.