Citations:hither twice

Etymology
A number of linguistic jokes: →  ( and  are homophones) →  (a back-formation from reduplication) →  ( conveys the implicit direction of  ≅ focus your attention toward [the speaker]).

Interjection

 * 1)  Indeed! Absolutely! Hear, hear!
 * 2) * 2006 September 10th, David Firth, Pulch: The Good Times, 1:47–1:50
 * Terry: A spot of Cointreau should galvanise the occasion.
 * Derek: Hither twice!