mitting -- applause; "Bob Dylan's surprise appearance at the benefit provoked heavy mitting from the crowd."
mogul -- the head of a major studio or communications company; from the title of the all-powerful emperors of India; "Media moguls Rupert Murdoch and Ted Turner have engaged in some heated verbal sparring of late."
moppet -- child, especially child actor; "Elizabeth Taylor is one of the few moppets who made the transition to adult star."
Mouse (also Mouse House) -- the Walt Disney Co. or any division thereof, a reference to the company's most famous animated character, Mickey Mouse; "The Mouse's music division is reuniting with talent manager Alan Smithee on a joint-venture label.
Movie industry bible Variety has published a glossary of its vivid and unique internal slang. Makes great reading, like something out of Damon Runyon. I’m going to start talking like this.