The jobby knocker was a person from days of old. When there were no toilets people took a crap in a abucket in the corner of the living room. The jobby knocker would come around daily and knock on your wooden door with a stout stick, he would collect your jobbies in a cart and trundle it away. Who knows what he did with it. Jobby knockers were thus smelly and not held in high respect. In days of yore it was an insult to be called a jobby knocker. These days it is used to insult someone who is a homosexual

Adj. Something that is expected to have a long lifespan by virtue of having existed for a long time, based on the lindy effect, named for the New York restaurant Lindy's, coined by Albert Goldman and popularized by Nassim Taleb.