Inspired by the classic Disney animated feature, Cinderella, Bitchity boppity boo is a typically feminine response to catty behavior or outrageous behavior. It's upbeat with an edge, and counters the snarl behind the statement with a little more of that "Little Miss Merry Sunshine is about ready to hack you with a machete" feel than perhaps wrawl!
Clarissa: Oh, that outfit really is you! Did you get it at Dollar General? No, wait - it looks like a real original. I bet you got it at Goodwill!
Desdemona: Oh, how did you guess? Bitchity boppity boo!