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1.
A growing practical joke among drinking buddies in Ireland. Whereby the assailant smacks the top of their buddies (or in some cases a strangers) bottle of beer with another bottle / glass.

The result is that the beer foams up violently and sprays everywhere.
On a night out, someone might decide to beerape their buddy, by sneaking up behind them and smacking the top of their beer bottle causing it to erupt everywhere.
by Gvictory February 12, 2010
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