Source : Webster's Revised Unabridged Dictionary (1913)

Techy \Tech"y\, a. [From OE. tecche, tache, a habit, bad habit,
   vice, OF. tache, teche, a spot, stain, blemish, habit, vice,
   F. tache a spot, blemish; probably akin to E. tack a small
   nail. See {Tack} a small nail, and cf. {Touchy}.]
   Peevish; fretful; irritable.

Source : WordNet®

techy
     adj : easily irritated or annoyed; "an incorrigibly fractious
           young man"; "not the least nettlesome of his
           countrymen" [syn: {cranky}, {fractious}, {irritable}, {nettlesome},
            {peevish}, {peckish}, {pettish}, {petulant}, {testy},
           {tetchy}]
     [also: {techiest}, {techier}]