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1.
Actually defined as a member of a despised social class, a commoner, a member of the plebs of ancient Rome. Also low-born, undisinguished, vulgar, and my personal favourite: vulgar-looking.

Other words with similar meaning: Scrut, Townie, Kappa-Slapper, Rude-Boi, Scum, Greb, Scav, &c.
What's red and orange and looks good on Plebs? ... Fire!
by Win February 10, 2004
 
2.
1)one who's inferior intelligence results in them making a complete titface out of themselves in public

2)one who has had their brain replaced with a mall cucumber whilst visiting the doctor fora routine check up

also used as the verb
plebbed, or to pleb
"jonny francis is a right pleb," cried cristina

"don't tell me that billy has fucking plebed it up again!"
by fred December 03, 2003
 
3.
Actual Dictionary Definition: A commoner.
by Pour October 04, 2003
 
4.
Short for plebian, derived from the period of the Ancient Romans. The plebeians were the general body of Roman citizens and those who were privileged were labeled patricians.
Nowadays, a pleb is one associated with those in the lower class. They often lack integrity and sophistication, while many people who consider themselves modern-day patricians often lookdown and mock them.
Man in hole: Oi. Anyone out there?
Man outside of hole: Not if there isnt anyone of my kind in there!
Man in hole: you mean someone who is outside of this hole?
Man outside of hole: chut up, pleb!
by Blackington September 12, 2006
 
5.
Lower class of citizens - inferior, common.

Originates from ancient Rome where patricians were elite, plebs middle and lower class but above slaves.
That's the humor of the plebs.
by DoTheEvolution April 08, 2011
 
6.
Short for Plebeian.

Today, Pleb is often used to describe a person who appears to belong to the lower or middle classes of society.

This term was originally used to refer to the class of common people in ancient Rome. These people were often poor or middle class, but could also be very wealthy. A wealthy Pleb differed from a Patrician (the elite/upper class) because they were not born into their social status, but rather moved up in society on their own steam.

Upperclassman: "He doesn't have an education and he has a crappy job that earns him very little money. He's such a Pleb"

by Trufs February 16, 2009
 
7.
anyone that is below you. It can be socially, economically, linguistically, intelligently, whatever, it doesn't matter. It is up to you to decide and is on a case by case basis. Though if you are calling some rich bastard like Warren Buffet a pleb than your first name should probably be Sultan, to put it in perspective. It is best to use the word to describe someone that is not around though because then they are not there to prove you wrong with a fat stack of cash or by breaking out the queen's english or some crap. However, calling someone a pleb usually does not lead to a fight because they are likely too stupid to understand how much you have just insulted them. It is really best used to embrace your own current well-being, in good fun, with a underhanded insult on the dregs of society.
A guy walks out onto his pool deck in the middle of the afternoon with a tray full of double patron margaritas for his friends and lobster tails and steaks on the grill and says "I wonder what the plebs are doin today?" and then wonders if he turned on the security system at his beach house.
by Loopdit July 07, 2012