What's that smell?

If you guessed "Smelly Ass?," you would be correct.  In a typical over overreaction, this guy protests too much to be believed.  He certainly would have been more likely to gag at the time of the close encounter, especially as he was rubbing his snout directly into the manfunk, rather than after the fact.  Like most guys, he probably plays stink finger with his own ass and likes it, but would never ever admit it.