one over (the) eight
1. adjective 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.
2. noun The final alcoholic drink that pushes a person from mild or safe intoxication to being very drunk. Primarily heard in UK. I was composed and in control of myself for most of the evening, but somewhere around midnight, I had one over the eight and started making a show of myself. It seems like Jenny makes a point of having one over eight every time she goes out on the weekend.