This is a strange trend I've been noticing around my friends lately - saying "hither twice". It's used as a kind of "I agree". Such as:

Bob: Do you want to go to the cafe?
John: Hither twice!

Now I, myself, use this. But I was wondering, where does this come from? I've never heard it used anywhere else. Any and all help is appreciated.

VSPrasad

How I used to hear tongues ask, as I sat here when I was new:
"Who is she playing the organ? She touches it mightily true!"
"She travels from Havenpool Town," the deacon would softly speak,
"The stipend can hardly cover her fare hither twice in the week."

http://www.ondamar.demon.co.uk/literat/xtr/hardy.htm

You can try these slang dictionaries:

http://www.peevish.co.uk/slang/links.htm

http://www.search.com/search?q=online+slang+dictionary