Ebay search auto suggest sucks, it is completely broken, often screwing up my typing searches, replacing words without my permission. It is not all that useful and deserves a bullet in the brain.
There is a option to disable it “Hide eBay suggestions”, but it is only cookie based and session dependent. Not good enough.
Here is how to get rid of it for ever using adblock for good!
Add this line to your adblock plus block list: “autosug.ebaystatic.com“
If you don’t have adblock you can certainly add the same domain to your hosts file, there is plenty of resourced on the inter-webs to show you how.