As I am not a complete ignoramus I did know that grumppa.
I did get the inference. Turning social norms on their head (or backsides).
As I said, farting is perfectly natural too.
Rudeness on GN seems to be becoming the norm, too.
Does anyone have this jumpsuit?

. I have not seen it, only heard of it - it may have been discussed on one of those BBC arty programmes, I can't remember.