This is a term to describe a douche bag, a Jakass, or a Bitch
It was invented to be more insulting because a douche bag will clean the pussy, while a plosher will make a dick dirty
It is used so the person it is directed at is even more pissed off then if you just called them a douche or a bitch
That kid looked like a Plosher to me.
You're not even good enough to be called a douche, you're more of a Plosher.
What a little Plosher bitch.
A complete jackass.
That kid is such a plosher!