Usually this means " the ignorant masses", or "the common people" and is used by somebody who thinks that he or she is above them.
The really cool thing about this is that most of the pretentious pricks who like to use the term don't know what it means, so they say things like:
"The hoi polloi are necessary for the rest of us who actually run the country", or "Without the hoi polloi, life would be less good"
Because the word "hoi" is "the", there's no need to use "the" when saying or writing this.
So those people who use it in that way prove that they are ignorant and uneducated baboons themselves. Don'cha just love it?
Chuck "You pretentious dickwad, I just love it when you kick yourself in the ass, and don't even know it!"
George " What are you talking about? I imagine you are one of the hoi polloi I was talking about!"
Chuck "Stop it, I'm pissing myself!"
Mildly derogatory way to designate the common people as a group, implying they are uncultured and apt to act stupidly.
see Panurgian Sheep
from Ancient Greek : "the many"
1. A person who votes for and or likes George Bush.
2. A person who you can't expect much from. Someone who thinks they're witty for liking something thats uncommon yet is the biggest hypocrite of them all and listens to other people for guidance.
3.A person who can't support and or think for themselves and relies on someone to take care of them.
A person who claims others are the 'hoi polloi' yet dosen't realize they're even lower than that.