Top Definition
Something that does not exist or is not real, but people believe that it does. (Literally a rat that does not exist).
Bigfoot is a Rattus Nonnus.
by There Is No Rat October 10, 2008
5 Words related to Rattus Nonnus

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.