Top Definition
An irrational fear (phobia) of breasts.
Get away from me with your giant knockers woman, don't you know I suffer from mastrophobia!
by boredoflife26 August 12, 2012

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.

×