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It means 'My God!' In German.
And it is spelt 'Mein Gott'.
It is also a popular Axis Powers Hetalia song.
'Mein Gott!' by the character who represents Prussia.
But in Germany, 'Mein Gott!' is usually used for 'My God!'.
ANSWER
Ach, mein Gott!
Gott ist ein Popstar was created on 2006-02-24.
The phrase that is used by priests in Germany is "Gott sei mit Euch".
Schlaf mein gott is German for sleep my god. Probably: Sleep, my God!