/techt/ , adj.
touched; slightly crazy.
Also, teched .
[ 1925-30; var. of TOUCHED; perh. repr. earlier tached (ME techyd ) in the compounds ( well- ) tached, ( evil- ) tached having the (specified) quality or disposition (ME tach ( e ), tech ( e ) trait, spot, stain tache spot (see TACHISM) + -ED 3 ) ]