exclamation. A testicular, Norse exclamation.
Related expression: by Zeus' balls.
Real citation: "For those with Quicktime, these movies are just great -- and TOTALLY SAFE TO WATCH AT WORK. Well, that is, if your work doesn't mind you using their internet connection to watch a -- really well done -- nine-minute viking story. By Odin's balls, that's good stuff."
(Bruno Pieroni, July 13, 2004, http://www.brunopieroni.com/blog/2004_07_01_archive.html)
Made-up citation: "By Odin's balls and Thor's hammer! Let's get this tasteful erotica film started."