be one over (the) eight
To be thoroughly inebriated. Primarily heard in UK. I think someone should drive Jerry home, he's one over the eight. I guess I was making something of a show of myself, but I was having too much fun to realise that I was one over eight.
be/have one over the ˈeight
(informal) be slightly drunk: From the way he was walking it was obvious he’d had one over the eight.This may come from a belief that a normal person could only drink eight glasses of beer without becoming drunk.