You must have heard of coincidences. Sometimes people may have same thoughts and opinions about something or sometimes they may also bump in a place that neither of them planned to be in? If we talk about the history and origin of the word Soutaipasu, then we can say that it is an old traditional word that is used by Japanese people in a fun or catchy way to describe some coincidences. https://www.reddit.com/user/ntdtvjp/