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"cave-dweller," 1550s, from Latin troglodytae (plural), from Greek troglodytes "cave-dweller," literally "one who creeps into holes," from trogle "hole" (from trogein "to gnaw;" see trout) + dyein "go in, dive in."
(Commodore) 1. A hacker who never leaves his cubicle. The term "Gnoll" (from Dungeons & Dragons) is also reported.
2. A curmudgeon attached to an obsolescent computing environment. The combination "ITS troglodyte" was flung around some during the Usenet and e-mail wringle-wrangle attending the 2.x.x revision of the Jargon File; at least one of the people it was intended to describe adopted it with pride.