The practice of project cost estimation based on the weight and/or thickness of the construction plans not on content. Also acompanied by the phrase: "What spec. book?"
This term transponds all fields of construction.
Estimator 1: Looks like the plans weigh 10 pounds.
Estimator 2: Alright based on subcontractor estimating this one will cost 1 Million. Send in the bid.
Estimator 1: What about the spec. book?
Estimator 2: What spec. book? Just send it in already!