What it means
Battered means properly drunk, not just a bit merry. You’re wobbling, chatting pure nonsense, and backing terrible ideas with the confidence of a pub prophet. In British slang it can also mean worn out, roughed up, or looking a state, so the context does the sorting.
Usage examples
"By chucking-out time Dave was battered, trying to pay for chips with his gym card, then telling the bouncer they’re basically family."
"He got absolutely battered at the stag do and tried to order a kebab from the cashpoint."
"Two glasses of wine and she's battered, lightweight, can't even finish the third without singing."
"I was absolutely battered after the pub and somehow came home with someone else's chips and no memory of the walk back."
"He looked battered this morning, half from the pints and half from trying to play five-a-side after two hours' sleep."