Definitions of rolling contract
a contract for a specific period of time (eg one month or one year) that continues for further periods of time until one party decides to end it. You must normally give the other party notice before a specific date if you want to end a rolling contract.
The mobile phones were sold with subscription bundles, often tying consumers into rolling contracts.
a contract that continues until one of the parties decides to end it
He signed a rolling contract with Kowloon Rugby Club where he was appointed captain.