A difficult task or someone who is difficult to persuade.
He's still not convinced although I tried my best to persuade him. Such a numb bum!
by sinthya April 30, 2006
Top Definition
This is what happens to a person's rear end after sitting for too long.
That movie was so long that I ended up with a major case of numb bum.
by Libertine September 04, 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.