The word gribely is often a term used by chavs,townies or pikies to decribe someone, who wears anything that could be considered not to be "cool" by chavs etc. Normally girbley is used as an insult towards people who could be classed as skaters etc. Used in the south of England
Chav: Oy, its a fucking gribley lets beat him up and stab him with our 2-inch-knives and then rockport him with out rockport shoes.
"Gribley": I'm not a gribley you poor pikie (and which point he/she starts to run)