laying pipe
 n.— «“laying pipe”: writing and delivering the onerous dialogue which provids backstory and the plot facts needed to support the weight of the funny (or interesting). Exposition, kids, and it ain’t fun. Example: “Geesh, all Dougie’s doing this scene is laying pipe. Couldn’t we give him a joke?” One always strives to lay pipe in an interesting way, or “hide the pipe” in an otherwise entertaining sequence. Such a two-for one is a pleasant flourish signifying your professional ability, like a nice chip shot.» —“Writing: Jargon Preservation” by John Rogers Kung Fu Monkey Apr. 15, 2005. (source: Double-Tongued Dictionary)

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