I think this reflects on the US - Germany relationship that has resulted in our current president's spy policies with our allies. It also shows how good our foreign relations policies are that major countries are willing to openly mock the US like this
It's a funny image, but one should keep in mind that the German secret service is doing the same as the NSA, in fact, they are participating in various ways, including sharing citizens data and mass surveillance software. The country is full of US army bases also.