An event when one suddenly understands something even if the concept had been explained several times before.
Mark had one of those lightbulb moments when he saw the ocean for the first time and realized how huge it was when he couldn't see the other side.
by pkljm September 25, 2009
when you have that light bulb appear and get a new idea. Just like in the cartoons you have one your self.
Hey guys I just got an idea; yes I had a light bulb moment!
by SophieMcChubbs December 12, 2010