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I suspect that someone has stolen one of your graphics and is hotlinking it. This looks like a referal in some stats programs.
Either that or they are linking to some data your site has to offer. Or it is a typo. Looking at the full log entry should let you know why.
That is assuming you aren't linking to your own site from an ebay auction - and then you should be able to figure out why.
If you don't block remote hosting of images via your .htaccess Chris_R is right that it could be someone using one of your images to list in an eBay auction. If you check your stats for image views, you might be able to figure out which image it is. Then do a search on the product to find the specific auction that is using your image. Once you have the auction #, report it to eBay, and they will automatically end the auction for copyright infringement and unauthorized third-party image hosting.
I get many referrals from ebay on my logs, when I click on them it takes me to the actual auction page that the link came from. It happens because they refer to my site as a useful information source on what they are selling and it is something I actively encourage.
Could this apply to you as well?