naut stands for 'psychonaut'

readmorewikipedia:

Former American president George W. Bush is widely known to use nicknames to refer to journalists, fellow politicians, and members of his White House staff.

• Dino (short for Dinosaur) - Jean Chrétien, Prime Minister of Canada
• Tree Man - Unnamed forest service official
• Light Bulb - National Energy Policy Development Group Executive Director Andrew D. Lundquist
  

Everyone knows about ‘Brownie’… but this amused me.