what does “Might be available” mean?

The global database for this domain is currently unavailable. We can not guarantee that this name is available. However, we will make a "best effort" attempt to register it. If the name is taken we will not charge you anything.

Note: Sometimes the database comes quickly back to normal. You may try the search again immediately or after 5 minutes. If not successful we advise you to register it with our system. We will get the name for you if it is available.