Not too happy with you using autism to call someone dumb, but I'll leave this up assuming it was just a one-off.
Definition of sash for Students. 1  1 : a frame for a pane of glass in a door or window. 2  2 : the movable part of a window.
noun. a long wide piece of cloth that is tied around the waist to make a skirt or at the shoulder to make a dress. It is worn by men and women in Malaysia and some other countries.