humm is a noise made when one is thinking... hummmm.. others use a "huh" but i use hummm cause it sounds more like someone rubbing their chin in deep thought.. rather than the "huh" which sounds like a monkey as they scratch their head....
other squeak words to be on the look out for..
YAY! = yahoo!!!!
mmmm= yummie!
yummie= Jayhawkk
so forth and so on