Well, here's what it means.

"Resol" can mean a number of different things. Some might interpret it as the word "loser" spelled backwards. Others might see it as the first 5 letters of the word "resolution". To me, it's just a bunch of jumbled letters that are basically meaningless.

"van" is simply Dutch for "from" or "of", no further explanation required. Please make sure not to capitalize the V. It looks hideous this way.

And of course, you already know what "Lemmy" is. Duh, we're both on it. In my username, it can also refer to the fediverse in general. Think of the latter as a continent, with Lemmy being a country in that continent.

So, I'm basically a guy from the fediverse. That's all you need to know.