Baseball is a drinking game in which players shoot 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, doing so in a way combining beer pong and flip cup.
Variation: if a ball is thrown and hits a cup it may be caught by "fielders" prior to touching the table or floor for an out.
In general, this will be a plywood board cut to proper size, sometimes painted with sports, school, or fraternity symbols and given a liquid-proof coating.
You may or may not get belligerently drunk from playing baseball, and it usually devolves into a contact sport by the 7th inning stretch.
Each player gets three attempts (strikes) to get a hit (make the ball in one of those cups).
A miss (hitting a cup without an opposing team member catching it) is considered a strike.
The opposing team can field the batter out by catching a foul ball (as described above).
If the player misses all the cups during any shot in the at bat it is considered an out.
If a player throws a ball that hits a cup and the opposing team catches it, it is an out.
Should a player throw an airball (the ball touches no cups), it is considered an out.
All catches must be made using the players off-hand (the hand that glove would be worn on during a real game of baseball).
An alternate set of rules (known as "Man Lodge Rules") exists to make the game higher scoring, feel more similar to actual baseball, and make home runs more rewarding.