Definition of "diggity"

We afterwards learned that this is spelled Dalgety, but it is considered rather vulgar, in Scotland, to pronounce the names of persons and places as they are written. When, therefore, I allude to the cook, which shall be as seldom as possible, I shall speak of her as Miss Diggety-Dalgety.

1897, Kate Douglas Wiggin, “Penelope’s Progress”, in The Atlantic Monthly, page 702

Let your hot diggity dog cool his tootsies on this picturesque creekside trail where nature is the name of the game.

1996, Eileen Barish, Doin’ Texas with your Pooch‎