I heard in the movie 10 Cloverfield Lane:
I looked through your wallet. Given as how I saved your life, I think that's acceptable.
I find the interjection of "as" odd. When "given" is used as a preposition meaning "in view of" or "considering", shouldn't it be followed immediately by a noun phrase or a clause? Is the use of "as" here idiomatic or grammatical? "Given as how" returns zero hits on Google.