Meaning

noun someone who plays golf poorly

noun a programmer who breaks into computer systems in order to steal or change or destroy information as a form of cyber-terrorism

noun a programmer for whom computing is its own reward; may enjoy the challenge of breaking into other computers but does no harm

originFrom Late Middle English hackere, hakker, hakkere (“one who cuts wood, woodchopper, woodcutter; (rare) tool for cutting wood”), from hakken, hacke (“to cut (something) with a chopping action, hack; to make a chopping action”) + -er(e) (suffix forming agent nouns). Hakken is derived from Old English *haccian (“to hack”), from Proto-West Germanic *hakkōn (“to chop, hack”), from Proto-Germanic…

Etymology from Wiktionary, CC BY-SA 3.0