(I'd guess it's originally related to the concept of "jerk" in physics. http://en.wikipedia.org/wiki/Jerk_%28physics%29 http://en.wikipedia.org/wiki/Jerk_%28phy

(I'd guess it's originally related to the concept of "jerk" in physics. http://en.wikipedia.org/wiki/Jerk_%28physics%29 http://en.wikipedia.org/wiki/Jerk_%28physics%29 ) It's been used in this context since at least 2010 by the Chrome team: http://en.wiktionary.org/wiki/Talk:janky http://en.wiktionary.org/wiki/Talk:janky