The term used by employees of bars and night clubs to mask the fact that they are bartenders. It is intended to make the occupation sound more important or part of the sciences
Golfer #1: My three sons are doing quite well. One is a wetland ecologist, one is a biologist, and the other works in mixology.
Golfer #2: No, your "mixologist" son serves Cosmos at a gay bar in South Beach. He is a bartender.