A person among a group of friends who ensures that everyone has had their dose of alcohol. It's always good to have a booze bouncer while the drink police is around.
Dude 1: "So how is school going?"
Dude 2: "Well actually, I'm on my last quarter-"
Dude 3: "Stop yapping and drink your drink! Don't waste precious alcohol you fucking pansies!"
Dude 1: "Fuck, the drink police came around, better drink up!"