In the clearest message yet delivered to immigrants by German Chancellor Angela Merkel, she told them:
"Get out of my country, you fickene schwarzes!"
In a speech in Potsdam, Mrs Merkel also commented that:
"Attempts to build a multicultural society in Germany have "utterly failed", and that the so-called "multikulti" concept - where people would "live side-by-side" happily - did not work.
Mrs Merkel's comments come amid recent outpourings of strong anti-immigrant feeling from mainstream politicians.
A recent survey showed that more than 80% of Germans believed that the country had been "overrun by foreigners".
The study - by the Friedrich Ebert Foundation think-tank - also showed that roughly the same number thought that some 16 million of Germany's immigrants had come to the country for the social benefits - just like they do in the UK.
Mrs Merkel told a gathering of younger members of her conservative Christian Democratic Union (CDU) party on Saturday - the Merkel Jugend - that at "the beginning of the 60s our country called the foreign workers to come to Germany and now they livehere... We kidded ourselves a while, we said: 'They won't stay, sometime they will be gone', but this isn't reality.
"And of course, the approach to build a multicultural society and to live side-by-side and to enjoy each other... has failed, utterly failed."
"We should have listened to Herr Hitler."
The crowd cheered.
In her speech, the chancellor specifically referred to recent comments by German President Christian Wulff who said that Islam was "part of Germany" as are Christianity and Judaism.
Mrs Merkel said:
"Although Islam is part of Germany, it is a part that I want to get rid of, like a fly buzzing around my Kartoffeln, or a piece of dog excrement that has lodged itself in the tread of my jackboot."
She ended her tirade with:
"lmmigrants should learn to speak German, with 'Fuck off back to where you belong' being the most important phrase for them to get a grasp of."