a woman (or man) who, for reasons of paid employment or otherwise, is required to fetch/pour beer for one or more individuals for a defined period of time. Although tasks such as taking away the empties and supplying their master with food are obvious additional duties for a beer b1tch, frequently they may also be required to perform tasks that are not immediately associated with purveying beer e.g. perform stunts or tricks to entertain a drunken crowd, turn a blind eye whilst their own drink is tampered with and, occasionally (usually later in the day/night), provide sexual gratification for his/her master or their nominated representative.
Tom was not looking forward to being a beer bitch at Oktoberfest, it would be bad enough pouring 1 litre steins for BG all day, but the thought of the boystea-bagging his own stein whilst he had his back turned, was almost too much to bear.
1) Someone who brings you beer in response to a yelling request.
2) An enabler who promotes your stoner alcoholism by bringing you beer which you are too messed up to retrieve on your own.
1) "Without my beer bitch I would be horribly sober"
2) "If Kevin were not such a beer bitch we would not invite him over"
The loser of drinking games or the bottom rung person in any activity that involves hazing -- usually involves being forced to drink large quantities of alcohol in a short period of time.
Stag: Wow, who are those gorgeous girls and what are they doing on our stag do?
Best Man: They're the Beer Bitches- now shush while I tie you to this lamp-post