lip dub
n.— «It was a pleasant surprise to find a little online refinement via the concept of “office lip dubs,” music videos made by 9-to-5ers from offices around the world. The videos are filmed in one long camera shot with the song dubbed over the footage during editing, which lends theatrical heft and volume to what would otherwise be a routine lip-sync.…The term “lip dub” was coined by Jakob Lodwick, 26, founder of Vimeo, a video-sharing venture.» —“Workers’ “lip dubs” show the lighter side of the office” by Dan Zak Seattle Times Nov. 16, 2007. (source: Double-Tongued Dictionary)