Yes, I've been asked this enough times for it to warrant a whole page to itself. It's a quote from The Hitchhiker's Guide to the Galaxy.
The mattress globbered. This is the noise made by a live, swamp-dwelling mattress that is deeply moved by a story of personal tragedy. The word can also, according to The Ultra-Complete Maximegalon Dictionary of Every Language Ever, mean the noise made by the Lord High Sanvalvwag of Hollop on discovering that he has forgotten his wife's birthday for the second year running. Since there was only one Lord High Sanvalvwag of Hollop, and he never married, the word is only ever used in a negative or speculative sense, and there is an ever-increasing body of opinion which holds that The Ultra-Complete Maximegalon Dictionary is not worth the fleet of lorries it takes to cart its microstored edition around in. Strangely enough, the dictionary omits the word ‘floopily’, which simply means ‘in the manner of something which is floopy’.
Basically, when I was searching for a Twitter username, I couldn't think of anything that was available. Then I realised I was a bit of a Hitchhiker nerd, and @floopily was available. And since then it rather appears to have stuck. So there you have it. Exciting stuff.