A level of measurement, in this case it denotes one 1.75 L bottle of hard alcohol.
You're guaranteed to find at least one of these hidden in every white, suburban pantry. Their main purpose is to sedate soccer moms and allow their underage kids to get shit housed and try to play tennis with the cat.
Man, last night was boring as hell until Mark found his mom's dysfunctional family sized bottle of Cuervo. Next thing I know we turned his living room into a slip n' slide and Ashley puked in the china cabinet.