Isn't it double negative? What does it mean?
Yes it is! "Didn't never" is definitely a double negative and is incorrect grammar. It means "didn't ever." The sentence should be "For some reason, Jenny didn't ever want to go home." If you have ever watched the movie Forrest Gump, you may notice that the character Forrest speaks incorrectly throughout the movie. This is done to fit the character Forrest.
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