At a house party, members of the house receive house cup. This automatically moves them to the front of the line for a keg. These cups are generally a different color or type than the regular cups given out.
Honorary house cups can be given out to close friends or people celebrating birthdays. There is generally a limit to the number of house cups each house member is allowed to give out in a night.
Because Jen is dating Danny she got a house cup, and was able to skip the long line for beer.