1 definition by Jeff Sanders
A person who is in their twenty's and think that they know about life, only to find out later how confused they really were.
1st Person: How old where you when you went bar hopping and clubbing?
2nd Person (in their 40's): Back when I was Twenty-Dumb I think.
2nd Person (in their 40's): Back when I was Twenty-Dumb I think.
by Jeff Sanders March 7, 2008