I saw this a few months ago while grepping through our apache log. Googlebot was submitting search requests for some weird stuff to our online catalog (for example: "Ctnblnd"). After some research I found that Googlebot was the only client which had ever searched for most of these terms and that they were abbreviations that our accounting department uses. I was guessing that they were doing something like this in the lab for words that they "didn't know" but ultimately put our search url into robots.txt because I didn't like our search results showing up in theirs.