over the eight
badly drunk, having consumed more than the eight drinks which would usually be enough for the average person to become very merry
"I didn't think twice, I was three or four over the eight, I didn't care if the girl was a coyote date" from the song "You'll Do"
One over the eight
Extremely intoxicated (drunk or pissed, whatever your preference)
"Call her a taxi, will you? She's had one over the eight and needs to go home."