From Longman Dictionary of Contemporary Englishhere we go againhere we go againinformalAGAIN used when something unpleasant is beginning to happen againMost of us are peaceful and decent, but here we go again, in our fifth war of this century. →here
Examples from the Corpus
here we go again• "You've been drinking again, haven't you!" "Oh God, here we go again."• Ronald Reagan fixed that, but here we go again.• You see, here we go again.• Most of us were peaceful and decent, but here we go again, in our fifth war of this century.• And now, here we go again with the Gulfcrisis.