Simply put, it's when one comes up with a thought, action, or saying that makes the user look like an idiot. From inventing odd techniques, like the drill
or the jackhammer
, to coming up with sayings that have no relevance in anyway to the current moment or conversation. Don't be sad though. Everyone has a moment or two. Some just have more than others.
Running into Family Mart while doing the drill in mid-air was a proud moment for everyone who saw.
You can stick that into your box of proud moments now.