There is this joy that pop into our brain that make us exclaim in excitement for getting an answer to a problem. The solution may come so sudden that will warrant one to exclaimed subconsciously.
When this idea or solution comes, it may make one make some statement like " yes! " or " gat it! " sometimes one make gesture with their hands to indicate that they have gotten the idea. Most times, people make fist while making such gesture.
I can remember one time I was trying to find a location to source for a raw material for a business I wanted to start. I was in the middle of people, discussing, but my head was trouble shooting on how to get the solution for that. " yes! " I exclaimed, while hitting the table in front of me with my fist.
This gesture most times happen subconsciously. And if it happens consciously, the person may continue saying yes! Yes! Yes! While Pacing around in joy.