I have to disagree -- that is a great domain for a fight-oriented site. Even something like YouTube/DM/etc. aggregation into a video blog would work well for it, and the domain "radio tests" well (aside from the plural/singular issue ie. I could see some people getting confused whether it's Slugfest or Slugfests.) In fact, you might consider replacing that parking page with just that, a simple aggregator running on WP wouldn't cost $50 to set up, would get the domain indexed for relevant terms, and would almost certainly bring in more than it is for parking -- all of which helps to better define and enhance the market value of the name (for such a specific name, at least.)
Frank