Catacorner | Definition of Catacorner by Merriam-Webster.

What is a Catacorner?

Definitions of catacorner. adjective. slanted across a polygon on a diagonal line. synonyms: cata-cornered, cater-cornered, catercorner, catty-corner, catty-cornered, kitty-corner, kitty-cornered oblique. slanting or inclined in direction or course or position--neither parallel nor perpendicular nor right-angled.

Is it catty or Caddy?

There's caddy, catty (pronounced with the same flapped t, but spelled differently), kitty, cata, and cater, any of which can precede either corner or cornered. Hyphens are haphazard and optional.