It is a word. Dictionaries aren't the gatekeepers of the English language; common usage and the ability to be understood is. Is it standard? Preferred? No. Do people use it? Yes.
Some good news though. I finally found out the difference between flammable and inflammable...so that's something.
Given their reasoning for adding this word, I demand the addition of santorum because we need a word for frothy anal lube.
According to Robert MacNeil in The Story of English, Shakespeare added some 1,700 words to the language. The OED now includes the term "omnishambles," first coined in the British comedy "The Thick of It." English is a growing language. It's a good thing.
What kills me about the whole prescriptivism/descriptivism thing is that dictionaries are written by descriptivist linguists who argue it isn't their job to tell native speakers how to speak, only to describe language as it is spoken, and so they add a word like 'irregardless' -- and then native speakers turn around and tell everyone that 'irregardless' is a word now because it's in the dictionary.
People don't realize that the first dictionary in English was compiled in the 18th century by Samuel Johnson. Before that, people wrote in English the way it sounded to them. Shakespeare didn't need no stinkin' dictionary. Also, I'm not endorsing "irregardless." I wouldn't use it in speaking or in writing (except here). I just found the article amusing and thought it might lighten the mood around here. I also refuse to use the neologism "woke." I do like "omnishambles," though. It's a bit more high tone than "clusterfuck," though I've been known to use the latter frequently.
Well, why wouldn't it be? In a day of PIN numbers, ATM machines and UPC codes, a redundant prefix fits right in with the general decline of the language...
I'd wondered what the correct term was for the ever-increasing thingamajigs we're asked to commit to memory, especially because so many of them are context-critical and can mean a dozen or more different things.
One of my many curses is remembering trivial stuff like that. I could probably write for a living but I prefer taking pictures.