MrDoomBringer have a forum post that explames what 1x1x1x1 is
here is the forum post text:
I posted this in a thread that subsequently died. I'm posting it here so you can refer back to it later. Keep the link to this forum. Distribute it. Tell people the truth. Because the truth is actually quite boring.
Lets talk about where the name comes from. Long ago, Telamon posted a number of stories about Roblox's backstory to the News. One of these included mentions of 2x2, the first brick. Copied over and over, every other brick were it's descendents.
Then, in a footnote, he mentions the evil 1x1x1x1. So that's where the name comes from. Blame John.
Lets talk about why people say he's a hacker. A guy who's name is long forgotten (not Zuka) found an exploit (not CheatEngine) to insert control scripts into online places. He sent me a message, telling me he had something to demonstrate. I joined him in Crossroads, and it started raining heads saying things along the lines of "He's coming back!" and "1x1x1x1 is coming for you!" and the likes. People in the server freaked out, I found it hilarious, he gave me instructions on how it works and I reported it to the devs. End of story.
Other people, like Dignity, would find other way to insert scripts, and people would assume that they have something to do with "the hacker group" 1x1x1x1.
Truth is, it was one guy playing off of a Roblox Lore thing. Get over it. It's that boring.This post was writen by MrDoomBringer him self
The pic you see it's me on roblox