A shush is a really cute thing that is just so cute that you cannot even think of a word to use for it besides shush. There are currently two shushes that exist in the world, but it is not impossible to become a shush if one tries really hard and/or is cute enough. There is a song by The Gorillaz called "19-2000" that depicts the "Shush" lifestyle. Shushes have been known to speak in a baby-ish voice.