Be a card-carrying member (of something) American British noun phrase
An official or active member of a particular group or organization and even paid the money to be part of a group.
Jenny is now a card-carrying member of the Geen Heart organization.
I, as a card-carrying member of the local Bussiness Association, encourage employers to offer some financial aids for employees during the rampant coronavirus infection.
Jane's approval was crucial to make a decision, for he was the card-carrying member of the Association for Conservation of Nature and Environment.
Doing something or using something a lot.
He's constantly drinking like it's going out of fashion.