One thing you could do to maybe find out where the traffic is coming from is do the following searches in Google
Make sure you have the quotation marks around it. If any page has that url as text this search will find it for you.
The other option to search for in Google is
Make sure that there are no spaces in that. This will show you what pages are linking to your product pages.
Be finding where the traffic is coming from may give you an idea of why they dreamed up the URL!