What appears on band aftershow or tour parties expenses for expenditure on illegal items. Generally accepted to be code for drugs but may include other goods / services in locales where they are outlawed such as alchohol or prostitutes.
The phrase may have originated on a Depeche Mode tour in the 90's (ref HolyMoly.co.uk)
They haven't been to generous with the Fruit and Flowers tonight, Tony's almostfinished the lot!
Katie: " How come you guys didn't go out and celebrate your anniversary?"
Nicole: " We were going to, but he had to take care of his little sister again."
Katie: "That sounds like deja moo to me."