High rollers are people who spend large amounts of money on luxury items or gambling. The term 'high roller' can be broken down into three parts: ELS (3 letters), SEMIS (5 letters), and BIGSPENDERS (11 letters). ELS stands for 'extra-large stakes, ' SEMIS stands for 'semi-professional, ' and BIGSPENDERS stands for 'big spenders.' Together, these terms refer to people who are willing to take risks and spend large amounts of money on luxury items or gambling.