You can define subjective terms any way you want, but here's a question: What if that 5" flaccid penis is 5" or 6" when erect? Plenty of "showers" don't gain much or even any size through erection. There was a guy who posted a few months ago whose penis loses girth when he gets erect, and a few responders had the same description of theirs.
I completely agree with what your saying there about subjective terms. That’s why I’m saying to me I see “hung” as a way to describe a flaccid penis. Personally I’d never use the term “hung” to describe an erect penis.
Example of how I see it: if a guy was 8” hard (99.9% would agree this a big or huge penis) and 3.5” or average soft, I wouldn’t refer to him as being hung, I’d say he has a big dick or whatever but to classifying him as hung I just couldn’t because of his flaccid being around averaged size.
It’s just my opinion, doesn’t me I’m correct or anything, it’s just how is see the term hung.