It means that it is earnest, or sincere.
If I wear a pocket protector to literally protect my pocket and am not aware or concerned with it being a symbol of nerdness ,then my wearing is earnest. However, if I think it’s _cool_ to wear it, knowing the arc of the pocket protector being a symbol of nerdness and I’m playing with that knowledge in my wearing of it than I’m doing so _with irony_.
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