Meaning of refrain in 青空 by "The Blue Hearts" The refrain of the Blue Hearts song starts like this: While the first part is rather clear, I don't understand the second part. What's the meaning of Thanks!

the hell, on earth

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=What do they know about me with only the information such as my nationality, my skin color, or my eye color?

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=What **_the hell_** do they know about me with only the information such as my nationality, my skin color, or my eye color?