Among soldiers in the 1970s, there was no such thing as a sky hook. It was a fictional item used to send rookies on a wild goose chase.

An unguardable basketball move perfected by the great Kareem Abdul-Jabbar

Upon fornication (usually in the shower), when the male after consuming multiple drinks gets a sensation of herculian strength while fingering a woman and proceeds to lift the woman skyward with only the use of his fingers in her vagina.

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, 68 volkswagen water pump, double pump conchitchilator with a two stage cadisafossil

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.

The act of lobbing an object in an awkward fashion (i.e an egg out of a sunroof whilst in a car) so as to hit your target, but gain plenty more props than a generic free throw.

very large helicopter with large lifting capacity, much the same as the American Chinook.