So go to hell and build a snowman, girl

from Eminem – Almost Famous Lyrics on Rap Genius

The phrase “when hell freezes over” is used usually in reference to something that is not very likely to happen.

Everyone doubted Eminem when he was first starting out and didn’t believe he’d ever make it. Now that he has, it seemed as though “Hell Froze Over” so now you are able to make a snowman in hell

He could also just be telling the girl to fuck off, by telling her to go do some impossible task

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