Extreme horniness. An unquenchable need for some pussy.
Hey Susuan, I hate to phone you up this late but I've got a bad case of beaver fever.
by Gregg July 12, 2003

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Top Definition
Beaver fever also known as (giardia) is a bactiria that is tranfered from one water sorce to another mostly by beavers since they live in the water. It is caused from infected fecal matter near water that has not properly been disposed of. This can cause animals and humans to vomit and give them diarya if not treated and could lead to death of dehydration.
Doc I got the beaver fever and I'm shiting my brains out.
by moose406 May 26, 2010

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the overpowering desire to pursue women for sex
Jim's got the beaver fever, this is the third time tonight he's had sex.
by the fev August 06, 2009

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A love for the protagonist in Rugby's greatest redemption story: Stephen Donald.
Sluzzas had huge Beaver Fever post- Rugby World Cup 2011
by roger76478 October 30, 2011

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When a straight woman ends up fucking another woman.
Dude I saw your ex-girlfriend with Stacey, she got the Beaver Fever!!
by DAVnCHAINS February 20, 2015

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Beaver fever is a terrible disease transmitted by beavers. Once a human catches it, the poor victim will slowly transform into a beaver. One knows when he has it when his two front teeth are longer than they should be and when he violently bites wood.
My brother is violently biting our wodden dinner table. HE IS BECOMING A FRIKIN BEAVER, he has beaver fever
by LKJOIJKL September 22, 2008

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A sexually transmitted disease, a gash rash
After shaggin' this bird, tha doc told me I had caught a 'beaver fever'
by Safecracker G September 10, 2004

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