I'd like to ask what "here we go" means in the following context:
Labour has spent the last week gurning about how unlucky it is with the media, the political weather and much else. But now comes proof that Lady Luck favours no one: it was not, despite the claims of some Tories, anything other than bad luck for David Cameron that the Irish vote on Europe coincided with the start of his conference. And so, here we go, back to the future.
Does "here we go" mean we're starting to go back to future?
here we go again"
It means what happened(or used to happen) is happening again.
An imaginary diologue may shed a light on it.
A:I'm glad that you have stopped telling stupid jokes.
B:Speaking of which,a joke has just occured to me...
A:Oh, no, here we go again!