He's Had the BISCUIT is a phrase used to describe someone who has held a particular job for a long time. It is usually used in a positive way to describe someone who has been successful in their role and has been able to stay in it for a long period of time. The phrase is often used to describe someone who has been in a position of power or influence, such as a CEO or politician. It can also be used to describe someone who has been in a job for a long time and has become an expert in their field.