Step out of my way, plebian, I own you and your (false) treasure.
Gadzooks. Look at them damned plebians, Quite a blot on our landscape what. And we're paying for their sodding burberry with our taxes. Fetch the flamethrowers at once Jeeves, Lets eradicate this problem now. Tally Ho old boy.
Somebody who does not demonstrate strong moral values. They may use sophisticated words occasionally but their actions are often barbaric. They feel like they know better than others but their actions suggest otherwise. You may call somebody a "plebian" when they are irritating because of their self-entitled nature. They have a big head and think they are smarter than others even though their actions demonstrate they have no good reason to think this. In general, and perhaps more traditionally, a plebian is a commoner or peasant.
"You say you do the dishes but you only ever do your own dishes and only when you feel like it, stop being a useless plebian".
I called my 19 year old brother a "plebian" because he brags about being a good driver even though he has had several motor vehicle accidents and destroyed two cars while at the wheel.
Person 1: Yeah, that's great if you're a PLEBIAN.
Person 2: Hey shitface, I got you a present.
Person 1: Really, what?
Person 2: It's a revolver loaded with one bullet. A note's attached that says: "Can you take a hint?" Well, can you? Can you take a fucking hint?
Person 1: Yes. Yes I can.
(Person 1 walks away with gift. Sound of gunshot follows shortly thereafter.)
Person 2: ...plebeian.