Prison Beaver 

A man prisoner's goatee

Tell that jerk to shut his prison beaver

Prison Beaver by Milosivich January 17, 2009

Beaver Poison 

Commonly used to describe a man who is riddled with STDs. Technically defined as a lethally poisonous herbaceous plant (Conium maculatum) of the family Umbelliferae (parsley family).

Don't go out with Chad, he's beaver poison.

Beaver Poison by Princess Clara January 12, 2005