Someone who tends to be either a skate(board)er, BMXer, MTBer or similar extreme sporter. Generally wears baggy trousers with long (two feet or more) chains from belt loops to pocket, hoodies and suchlike. Usually likes rock and metal, but many are also into hip-hop these days. can be an insult esp. from townies however grebs don't actually care what they are called Example: This place is full of grebs. Look at all the skateboards.
GREB, GRUNGER, GREEBO
Meaning of GREB, GRUNGER, GREEBO in English
Slang English vocab. Английский сленговый словарь. 2012