Meaning

noun a narcotics addict

noun someone who is so ardently devoted to something that it resembles an addiction

originEtymology tree English junk Proto-Indo-European *-kos Proto-Germanic *-gaz Proto-West Germanic *-g Old English -iġ Middle English -y English -y English junky From junk + -y (adjectival suffix).

Etymology from Wiktionary, CC BY-SA 3.0