Here is a great article that I thought you might find interesting. Enjoy!
Listening to Your Bees
by Peter Dight
I believe the hiss is a warning…
I’ve a reasonable library of beekeeping books, and a couple of years ago I was reading an old book which mentioned listening to your bees to see if they are going to swarm. It told of how a queenright colony, when their hive is sharply tapped upon, will react by ‘hissing’. I believe the hiss is the bee equivalent to a warning signal, generated by a section of the population fluttering its wings in response to the vibration caused by the tap.