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A burf slap is a rule in beer pong where a team gets one chance per game to backhand the opposing team's ball as it reaches a cup, without any penalties. If a second burf slap is used, that team loses. Burf slaps make beer pong more interesting and can be a great tactical move for those strategic players.
Player: "If I make this shot we win"
Opponent: "You're forgetting I have my burf slap still"
by Sam Isaac May 10, 2014