Top Definition
invented by a teacher at Stevenson High School in Lincolnshire, IL, meaning a person being stupid and or careless.
Frank: Jane stop being a nimnu and turn off your straighter before you leave the house!

Jane: It was an accident.
by j.w. pepper September 15, 2009
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.

×