A classic game for the purpose of meeting people, not for getting drunk.
Everyone sits in a circle, generally male - female. Someone chooses to start, and places the card against his/her lips, then using nothing but air pressure passes it to the person sitting next to him. This person takes the card by sucking on it and attempts to pass it to the next person, of course, never touching the card with hands.
If the card is dropped during the exchange, those involved take a drink. Then the game resumes.
There is another version where after the card is dropped, it is torn in half, and then the game continues. Eventually, there becomes more lips involved in the exchange than actual card.