taboo has always been a crowd favorite, i say you buy the game
Amazon.com: Taboo: Toys & Games
also i played a few drinking games at slumber parties it worked… games like
NEVER HAVE I EVER…
The players sit in a circle or around a room and someone starts out with the phrase “Never Have I Ever” (insert something you may have done or want to find out if another player has done). If anyone in the group has done this they have to take a drink (this is where us girls put a piece of bubble gum in our mouth). If you have not done it and you wanted to find out if any of your friends did then you don’t have to do anything. If only 1 person is guilty of doing it then they must tell a detailed strory about the events. The play continues around the room until you learn everything about your friends or are burnt out from bearing your soul…OR WHEN YOU CANT HANDLE ANY MORE GUM IN YOUR MOUTH 
Example: If the you say “Never Have I Ever Gone Clubbing” and only two of you party goers are guily. You just learned a secrect… If only one person is guilty then you get the story. Have fun and feel free to get very personal.
Another game we played was that we sat in a circle and passed out two squares of paper to each girl. We asked them to write a question on each square. We put all the squares in a hat or a deep bowl and each girl took a turn fishing a question out. If they got their own they could put it back in the hat and dig again. they had to answer the question OR if they chose not to then they had to dance to a song we put on based on a cd we made for like a minute. Both ways it served as good entertainment. So when the first girl reads her question and answers it, or dances, her turn is completed. Now who ever wrote that question is the player to go next and dig in for their square.