this is a term used by people for when someone, preferably by the name of aidan, says something or posts something that isn’t funny at all. that is when the term is used to show how unfunny your friend aidan is.
An Adan moment is when Someone asks you to stop a matter that annoys them and they do it anyway because they aren't mentally capable of understanding that.
When he was told to stop making dumb shit but did it anyway, it seems to me he was having an Adan moment.