Meaning

noun a garment worn around the head or neck or shoulders for warmth or decoration

noun a joint made by notching the ends of two pieces of timber or metal so that they will lock together end-to-end

verb masturbate while strangling oneself

originGenerally thought to be a variant, attested since the 1950s, of scoff (“eat (quickly)”) (of which scorf is another attested variant), itself a variant of scaff. Sometimes alternatively suggested to be a dialectal survival of Old English scearfian, sceorfan (“gnaw, bite”) (compare scurf).

Etymology from Wiktionary, CC BY-SA 3.0