Top Definition
The state when a person is so convinced of their own self-righteous assertions that he or she will actually have a tangible feeling in their ass (variant of ass-certain).
I newed so much that Forrest Gump was a real person, I made an ascertion!
by TheWordSir June 26, 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.

×