The official scale used to measure a drunken state.
A 1 to 15 scale, 15 being sober, 1 being dead.
Sam was gone, you can tell he can't handle his drink, he was pulling a 5 on the Glasgow!
"Call an ambulance, she won't wake up"...later that day..."the paramedic said she was lucky, she was 3 on the glasgow scale"
"Nah I've only had a couple, I'm still in double figures on the glasgow"