"easily irritated," 1592, teachie, in "Romeo & Juliet" I.iii.32; of uncertain origin. Perhaps from Middle English tatch "a mark, quality," derived via Old French from Vulgar Latin *tecca, from a Germanic source akin to Old English tacen (see token).
one well-versed in the latest technology, by 1984.
A computer enthusiast, expert, etc: But nerds these days aren't what they used to be. Many of these techies who grew up with computers have gotten older and gotten a life/ Or maybe it was when Conde Nast invested in the glossy techies' magazine Wired (1980s+)
Irritable; irascible; testy: the days when tetchy film crews invaded the center of soporific conferences
[1592+; fr dialect tetched, ''crazy, touched in the head'']