'Stultus' is a Latin word and it means 'Stupid/Foolish'.
stultus is the pseudonym I regularly use on different platforms. If this is not available on a particular platform, I use slightly altered versions like
I started to use this pseudonym in IRC chat-rooms in 2008. Those were the days, my friends. Those were the days. Pseudonyms were a thing in IRC. Also I think it is cool to have one. Thus the name and thus the domain name.
I recommend reading this article on wired.com - We Need Online Alter Egos Now More Than Ever. Technically a pseudonym is not necessarily an alter ego, but you get the idea.