End of

The English phrase used by British drama Coronation Street, often features the use of the term "End of." Does this mean, let's not talk about it any more or, that's the end of this conversation?

It's a very recent piece of street slang, and it's roughly equivalent to "Period" or "Don't bother trying to argue, because that's my position and you won't move me from it" or "That's it and all about it." (VSD)