n. A drinking game in which players attempt to throw ping pong balls across a table into an opponent's half-filled cups of beer. Players are required to drink the beer from any of their cups into which the opponent throws a ball. The first player to hit all their opponent's cups wins. The loser is required to drink whatever beer is left on the table (in opponent's cups). For sanitary reasons a cup of water is kept at either end of the table to wash the balls off after each throw, but if you've ever played you know it doesn't really help.
Note: Table size, number of players/cups, and house rules concerning bounces, misses, and crossovers vary depending on the college/fraternity/drinking club involved.
Addition: This definition of beer pong is technicaally Beirut, but the orginal version of beer pong is so widely unplayed that the name is now a synonym for Beirut, especially in the South and at public universities.
Abbie has a beer pong addiction, and we may have to intervene.