Top definition
The act of riding a bicycle down a steep hill or grade with no chain or brakes. It's the thrill of speeding down a grade or hill with no brakes and the challenge to come to a safe stop at the bottom of the hill or grade. Not crashing is the challenge!
Johnny broke his left arm after crashing while cykill speeding on eldon hill.
by cnh4ever December 06, 2008
Get the mug
Get a cykill speeding mug for your dad José.