Where does bitchin come from?

The term "bitchin'" originated in American slang during the 1970s, primarily associated with surf and youth culture. It is an informal adjective used to describe something as Excellent or cool. The Word is derived from "bitch," which has historically had various meanings, but in this context, it conveys enthusiasm and positivity. Over time, "bitchin'" has been embraced in various subcultures and continues to be used in casual conversation.