Top Definition
When someone's testicles are visible from the side of their shorts or boxers.
After I finished running, my girlfriend got a glimpse of rabbit brains hanging out the side of my running shorts.
by Rod Slinga January 06, 2007
5 Words related to RABBIT BRAINS

Free Daily Email

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

Emails are sent from daily@urbandictionary.com. We'll never spam you.

×