The sound you hear from at least 5 people in a room when you say something that crosses the line. Everybody says "AWWWWWWWW", and because there are so many people in the room who disapprove it is like surround sound, Dolby style.
*Somebody makes a joke*
*Someone else makes a joke, but it is too dirty/wrong/offensive*
They just got a Dolby Disapproval