Mispronounced version of the word Dolby, which was a noise reduction system used for music recordings. Made famous by a girlfriend of one of the characters in the movie Spinal Tap, who got mocked huge.
Girl: "Was that recorded in Dobly?"
British Musician: "Did you just say Dobly?"
Girl: "Yeah, Dobly, innit?"
British Musician: "You mean Dolby, right?"
Girl: "Wotevah, yeah, brilliant!"