1.as a suffix, -nosity is similar to -ness, and is generally used to describe something.
2.nosity can also be used to generalise about something (e.g. a person's situation) much in the same way as words like "malarkey" or "fiasco" are.
3.also similar to nub ( as in, the nub and gist), nosity can mean the point.
1."hehe get me and my infinite humournosity"
2."yeh, remember lily and her nosity about shoes?"
3."the general nosity was that she was a smelly poo"