On a lucky STREAK is an expression used to describe a period of time when someone experiences a series of fortunate events. The term can be broken down into two words, 'HOT' and 'STREAK'. HOT is a three letter word meaning having a high degree of heat or a high temperature. STREAK is a five letter word meaning a long, thin mark or line. Together, the phrase describes a period of time when someone is experiencing a series of good luck.