Not all testers code. Not all coders test. If you do plenty of each in any way you deserve this tag.

The favourite language is Ruby, because if it's expressiveness & felixbility as well as the available libraries—especially those useful for testing (WATIR, Cucumber, interfaces to a whole lot of services etc.) I use(d) it …to build an entire (and, obviously tailored to customer needs) automated test framework for a client (including adding test results into a wiki). …to send and pick up XML files via FTP, SOAP and other interfaces, …to analyze test logs (and find bugs in the testframe work used at that place), …to match ticket IDs in a couple of (different) bug tracking systems, …to "scan" existing test case management system content for consistency (Yes, that needed to be done.)