A fat teenager that makes up a lot of nonsense. Usually lives in a council house and loves traction engines. A wilko's breath normally smells like rotten garbage.
'That fat kid that loves tractionengines is such a wilko'
'Hey, that kid's breath stinks and he lives on Queen Street, he must be a wilko!'
Wilko - an incredibly strange bloke, the sort who gets a kick out of putting cardboard in the landfill instead of recycling and enjoys catching flies and dissecting them using chopsticks.