BOOM is widely used in the beer pongcommunity for pretty much any reason. It is shouted as loud as possible so that everyone is aware of what just happened and are now compelled to BOOM as well. Can be used in conjuction with LFG
Scenario 1
Mike - "I just smashed some bids tonight"
Chris - "BOOM!!"
Mike - "LFG"
Scenario 2
Crowd - *chanting Iron Wizard*
Pong Ferrigno - *hits cup*
All in attendance - "BOOOOOOOOOOOOOOM!!!!"
Used when one has just won an argument, debate, or other point of conflict. Most effective when the winner gets overexcited, slams their hand on the table and tries to rub it into their opponent.
Hilarity added when the winner is an Irishman in London.