Top Definition
1. After telling somebody off, add this word to give it some more umph.
2. After accomplishing a really hard yet nerdy feat give it some extra power by adding it to the end of a sentence.
1. (Guy A) You really suck.
(Guy B) Well your mom sucks! Beernf!

2. I totally beat the last level in Katamari Damacy! Beernf!!
by Robot November 23, 2004
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