(US & Canadian) a Y-shaped implement with a loop of elastic fastened to the ends of the two prongs, used mainly by children for shooting small stones, etc Also called (in Britain and certain other countries) catapult
1849, from sling (v.) + shot (n.). As a verb, from 1969. The piece of stone or metal hurled from it is a sling-stone (late 14c.). A slung-shot (1848) was a rock wrapped in a sling, used as a weapon by roughs and criminals.