gute Reise! = (Have a) good trip!
That is german. It means 'good travels'. However, be careful to use it in the correct context :)
It means "journey" or "travel".
Germans - Deutsche the Germans - die Deutschen
The German word for "German" is "Deutsch". Pronounced doitch. "Deutsch" as a noun is neuter, thus the definite articles are "das" (nominative and accusative), "des" (genitive), "dem" (dative). When...