An extremely unruly person, such as might need to be "kept on a chain."

Someone who is attempting to do free-running or any similar movement, but failed miserably, then posting a video of it online.

one who is "hip"; up with the times

Someone who defines themself as a hot rodder but has never worked on a car before. They pay a shop to build a car and perform modification/maintenance instead of doing it themself. Often they dont even know anything about the car they had built.

A particular class of douchebag who usually wears a gold chain with extra douchosity. A player. Very sleazy sometimes also has a 70's porn moustache. Warning: Even if personality & looks seem ok, a gold chain tells the real story. Steer clear at all costs.

In the Facebook game Mob Wars, the levels where other mobs will chain you no end for good XPs

an addicted smoker, smoker of cigs, cool people but bad, smokes a lot