decoy drink 

A cocktail that doesn't contain any alcohol. Reserved for friends that are too drunk to notice the difference but refuse to stop drinking.

"Dude, Kaitlyn can barely stand. Why do you keep giving her vodka tonics?"

"Chill, man. Decoy drinks... nothin' in there but tonic."

decoy drink by ACNY January 6, 2008

Drink decay 

Drink Decay
• Refers to the slow decline of activity in Drink preceding, during and after the Leaving Cert. When reaching the chronic stage of decay, it leads to Drink Death. Sometimes referred to

The group was dying slowly but surely “looks like drink decay to me”

Drink decay by lil slug February 4, 2023