The Big Bang is a cheesy term which describes how the entire known universe expanded rapidly from a single point 13.7 billion years ago.
Mystical or "highly sensitive" people have always thought there are dimensions to existence beyond the physical universe where time and space do not work the same way.
"Big Bang" could mean our parents having sex, which brought us into existence. In Traditional Chinese Medicine, each person is a microcosm of totality.
The thought "Big Bang" also brings to mind World War 3 Nuclear Explosions, which some think means the end of life on Earth and others feel is a new beginning for all of us.