A greebo is a person who listens to rock/punk/metal music and doesn't follow fashion trends.
They don't usually class themselves as being a greebo but are assigned that title by trendies/rudes. Some of them may look quite threatening but generally they are all around nice people and they resist starting fights or arguments with people who do follow trends. However, if you were to ask one if they had anything against trendies or rude boys their answer would seldom be 'no'. Almost all Greebos have some kind of disliking towards trendies mainly because they make their lives hell. Abuse is hurled at them when they walk down the street and they frequently get the crap beaten out of them for absolutely no reason other than the fact that they are different.
Greebos also seem to be fairly itelligent people if not it one way, they are bound to be intelligent in another, this may contribute to why greebos rarely start fights with trendies and rudes, because they are intelligent enough to know that it wont solve anything.
Greebos are alternative people who just want to be treated fairly.
Trendies: *sniff the air* Look, theres something that looks nothing like us, lets make it's life a living hell.