Zeus (noun) is formally know as the "king" of all Greek deities and ruler of Mount Olympus. As an adjective it is used to describe something that is amazing, awesome, indescribable, and so on. It is most often used in place of the word "epic" because that is just getting annoying.
Although a god in Greek Mythology, Zeus is the name of a german shepard owned by Roman Atwood, a youtuber with 2 channels over 10,000,000 subscribers each. Zeus died a couple weeks ago, he will be missed by many. Forever.