1) In construction work, it is one of the initiation rites of passage given to all new apprentice workers, and thought to be very funny by senior workers in on the gag.
see also - rock stretcher, 68volkswagen water pump, double pump conchitchilator with a two stage cadisafossil
The foremanjust sent that new guy out to get the sky hooks, he'll be right back.
A sky hook is a fictional apparatus, the retrieval of which is demanded of newbie grocery store clerks as a kind of lighthearted hazing ritual. Often combined with bucket of steam.
Billy, go grab a sky hook and a bucket of steam and get started on those windows!