Hätte, hätte, Fahrradkette. That means: Would have, would have, bicycle chain. Which means: Nobody cares about what would have, could have, should have been. It’s a common saying. Many German excuses, cop-outs, and rationalizations include the word hätte. Fahrradkette just rhymes with it in a mocking way.
            Dann zieh doch nach Berlin, du Lauch. That means: Then just move to Berlin, you leek. Which means: Nobody cares if you move to Berlin, just do it already. It’s not a common saying. Somebody scribbled the words on the bathroom wall of a nightclub in Vienna.