Beer pong (also called Beirut, Ruit, Lob pong and other names) is a drinking game in which players throw a ping pong ball across a table with the intent of landing the ball in one of several cups of beer on the other end. The game typically consists of two two-player teams, one on each side of a table, and a number of cups set up on each side. There are no official rules, so rules may vary widely, though usually there are six, ten or 15 plastic cups arranged in a triangle on each side. The number of players on a team can vary as well, from one to three or more.

When a ball lands in a cup, the defending team must consume that cup's beer. The game is won by eliminating all the other team's cups before one's own cups are eliminated. The losing team must then consume all the beer remaining in the winning team's cups. The order of play varies - both players on one team shoot followed by both players on the other team, or players on opposite teams can alternate back and forth.

Today, beer pong is played at a multitude of North American colleges and universities and elsewhere. The game is also played by high school students, despite the fact that furnishing alcohol to persons under the age of 21 is illegal in the United States.

Although the preceding guidelines are common, the rules may be subject to a wide variety of modifications and additions that often vary based on the area of the country, the state, or even the house in which a particular game is played.