I used to work in QA for one of the largest video game companies and the term "jackrabbiting" was quite commonly used in our dept. At my second QA job, I worked for one of the largest mobile developers and again - the term was quite commonly used... however now I am doing QA for a software development company and whenever I mention the term jackrabbiting I see nothing but blank stares from my fellow co-workers. Now the second company consisted of many former video game testers, so its quite possible they picked up the term early in their careers.
I was curious if many other QA analysts have heard the term "jackrabbiting" or in context "I've been jackrabbiting the front end for the past 30 mins after our release and haven't encountered any issues". It essentially refers to ad-hoc testing, or unscripted testing.
If we are talking about terms people made up, I have new one: Squirrel.
Different from a bug or a defect, a Squirrel is something that is not easily reproduced and difficult/impossible to report. Sometimes your not even sure you actually saw a squirrel, that's how you know it's a squirrel.
Also: if you talk to developers about squirrels too much they're gonna think your crazy.
Software Testing, Second Edition: "Intelligently weighing the risks and reducing the infinite possibilities to a manageable effective set is where the magic is."