Sound made by the little dead puppy-dog in The Great Jhonen Vasquez's Unbelievably Incredible Book : "I Feel Sick, Volume 2"... Yes, the doggy said "moof".
The term ‘moofing’ is designed to describe where you are/what you’re doing when you’re not at your desk or even in the office, but are at the same time fully contactable and able to work as normal.