"Uber"comes from the German language and means "above". English speakers, particularly in America, have made it to mean "very". The will use it as a prefix to other words. Uber collectors, indeed! I can see why you thought it was a noun!!
So, then, what I was referring to were those of us who have enormous, uncontrolled fabric collections - ME!! And I bought more today. Love the collecting part, and otherwise I am a sane and good woman. :shock: