Top Definition
A bone in the penis (penis bone, boner) usually found in most mammals, like dogs, cats, and walruses. Humans do not have a baculum(erections are caused by blood flow); but girls have the the analogous equivalent- a Clitorus.

In other words, it's the actual missing boner taken from Adam's penis to make Eve(Hebrew doesn't have a word for penis, so they used rib), and the area where God closed the flesh up is the perineal raphe.

Slang- An erection so hard, long, and everlasting like priapism(but not as long or fatal), that it's mistaken for an actual bone grown in the penis.
Ah crap, I couldn't stop thinking about that all-night threesome that I had last night, and my penis grew a baculum.
by Ryuseiken September 20, 2006
5 Words related to baculum

Free Daily Email

Type your email address below to get our free Urban Word of the Day every morning!

Emails are sent from We'll never spam you.