Beaver is a slang term for vagina. In modern usage the phrase “I’m hunting the elusive beaver tonight” probably does not refer to conventional hunting for small rodents.

The origin of this term is believed to be the fact that a vagina can, from a certain angle, resemble a small furry creature.

The word Beaver is used in the slang expression “Beaver Fever” to denote an acute case of “getting the horn” or “doing the unicorn”.