360 Bartender

A bartender who's head is on a swivel and keeps your drink(s) refreshed without hesitation. Generally hard to find, especially at singles bars where the bar keep is more interested in scoring than earning a gratuity.

That dude was a 360 bartender. I never had to ask him for anything, and neither did anyone else. He was Johnny on the Spot, and even slid me a free beer after my fourth round with subsequent tips. Bravo!