tat 1 |tat| |tøt| |tat| verb ( tat•ted |tødəd|, tat•ting |tødɪŋ|) [ trans. ] make (a decorative mat or edging) by tying knots in thread and using a small shuttle to form lace. ORIGIN late 19th cent.: back-formation from tatting . via my mother again, the crossword champion.posted on friday december 10th, 2010 at 11:00 (CST)