[Sundae]

The opposite of nose porn for me is when you get a smell in your nose that you dislike and you can't get rid of it.

Example:
It was sheer greed - we'd had cream cakes at work the day before, and the last person to leave hadn't thrown them away. As the office was quite cool (temperature wise) I thought I'd just try one to see if it was still edible. Instead of getting a bit of cream on my finger to test it I picked up a cake and bit into it. The cream squeeged out, up into my nose, and yes - it was off, sour, turned, whatever you want to call it. All day long, all I could smell was that rank cream.