Short for youth. A no good pikee (seepikeys) who spends his time abusing, threatening and trying to look hard. This behaviour is only exhibited when pikeys are in groups of 5 or more, as they lack confidence and physical presence to behave such on their own.
A GRIMEY yout behaves similarly but may in fact have the physical presence, or carry a pocket knife to be considered a threat.
LondonMandem: Some minor yout tried it wen i was walkin to your yard!