Hooky - a term used mainly in London and Southern England to describe people, items or situations that are dodgy, crooked, bent or just plain below-board. Often used in conjunction with gear to describe items that are possibly stolen or otherwise "hot".
"I got this hooky dvd player from a guy down the Winchester."
"He's got a bootload of hooky D&G bags from the continent."
Yo-Yo: A term used to describe the sponging 10 - 14 year olds who roam around amusement arcades, accosting strangers for money. This is usually opened with the statement "Yo, yo, gimme fifty pee."
Yo-Yo's are usually sent packing with a little verbal assault (or physical assault - it's all good in this situation).