Wiktionary
thank you so much
phr. (alternative form of thank you very much English)
Wikipedia
Thank You So Much (Desperate Housewives)
"Thank You So Much" is the 38th episode of the ABC television series, Desperate Housewives. The episode was the 15th episode for the show's second season. The episode was written by Dahvi Waller and was directed by David Grossman. It originally aired on Sunday, February 19, 2006.
Usage examples of "thank you so much".
They were able to agree quite early in the evening, because Clurg got up after eating the cheese, said warmly, Thank you so much!