Battered means you’re properly drunk, not just rosy-cheeked. The booze has absolutely done you in, so you’re wobbling, talking nonsense, and making decisions you’ll regret by breakfast. You’ll hear it after a big night out, footy, or a messy work do. Also used for feeling physically knackered, depending on context.
"By chucking-out time Dave was battered, trying to pay for chips with his gym card, then telling the bouncer they’re basically family."