To indulge/vent an urge that society does not approve of -- this can be fighting, partying, drinking, having sex, smoking pot... whatever. It implies that there are other times when you're a "respectable citizen" and repress the urge -- full-time party-animals are not getting their ya-yas out because they always act that way.

A person who gets the vaccine and and flaunts it will high end shopping, trips, and parties