whiskey plank
n.— «The whiskey plank, as it is called because sailors traditionally have a drink or ten after they finish planking a ship’s hull, was cut to fit by Teddy Huff, who has been working at the shipyard about five months.…When he put the final bolt in place, a cheer went up across the shipyard.» —“One last plank and a shot of whiskey make it real” by Brian Hicks Post and Courier (Charleston, South Carolina) July 22, 2006. (source: Double-Tongued Dictionary)
Further reading
Jill from Greenville, South Carolina, wants to know why pickle automatically means “pickled cucumber,” as opposed to other pickled vegetables, such as onions and carrots. The answer has to do with prototypicality, the cultural agreement that one...
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In film production, the last shot of the day is traditionally known as the “martini shot” for similar reasons.