Zombie Beaver 

1. When a female's genitalia falls asleep during coitus, typically due to understimulation
2. The female version a Petrified Tree
3. A wood-chucking mammal that builds dams in rivers that has been literally zombified after being bitten by an existing zombie.

We were totally getting it on, and then like after 3 minutes it was so bad I got Zombie Beaver

Zombie Beaver by JFray October 26, 2006