We've divided up the expressions so you know what to say and what not to say. These contain some examples of vulgar language.
10 revealing facts about German. Get your head around tongue twisters and jokes. It's also available in German with audio.
One possible explanation for the origin of this accusation and the fact that it was repeated against Frankfurt could be the fact that the German slang word 'Digga' (roughly equivalent to 'Bro' in ...