The barracks is a building where unmarried military personnel live, it is mosty inhabited by men. A barracks bunny is a female military personnel who lives in the barracks and has random casual sex with many men in the barracks.
CPL Jones: " man, i havent gotten a piece in a good minute...ima hit up "so and so" the barrack bunny, shes a sure thing"
Someone who works behind the bar doing everything but serving drinks. They do things like restocking the fridge, replacing spirit, wine, and juice bottles, cleaning, replacing ice, et cetera.
Lorie is a barback so she spends most of her time restocking the bar area.