In 2009, StackOverflow and Discourse developer Jeff Atwood called out prominent Apple commentator and Markdown developer John Gruber for failing to produce an unambiguous Markdown specification or maintain the Markdown reference implementation. [more inside]
This is just the top 30, what I consider to be the most likely candidates for actual new programming jargon based on community upvotes, not just "funny thing that another programmer typed on a webpage and I felt compelled to upvote for hilarity". Because that would be Reddit. Coding Horror presents the top 30 Stack Overflow New Programming Jargon entries.
Please don't learn to code (Coding Horror). Please Don't Become Anything, Especially Not A Programmer. (Learn Code the Hard Way).
The downward spiral that is Evony, a web based multi-player game, advertising. Also: The Best Worst Ads by 1UP and fake in-game ads by Something Awful.