Top Definition
Another word for idiot or a weirdo or someone that has done something silly.
'Your such an nimbrain sometimes!'
by KC&GD January 27, 2012
A polite way of calling someone an Idiot.
Girl: I'm so much cooler than you!

Guy: Oh, you really are a Nimbrain!
by thecoolestguyintheworld February 16, 2012
Someone who says/does something or is stupid.

A polite was of saying Retard or Dickhead etc.
Kathryn: I'm so much cooler than you!

George: Oh dear, you really are a nimbrain!
by supercoolguy February 11, 2012

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.