behind bars = behind bars
In other words, if you hang out too long on da local pub-stools tossing down tall frothies, you will likely end up "cooling off" in jail after participating in one or more drunken brawls, staggering about in public, committing an OUI offense, etc.
Ethan Couch's infamous drunk-driving event didn't even happen as a result of his being in a tavern --- i.e., he boozed it up while partying at a friend's house --- but he still wound up in a similar "behind bars = behind bars" situation.