Top Definition
A Random Boner, or an unexpected erection. Called a rubidium due to the element's symbol being Rb
I was sitting in maths when all of a sudden, i got a Rubidium!
by Face-Munch3r September 01, 2011

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.