A mitmot is also known as a windowlicker
or chinbiter. Basically a person incapable of caring for themselves whilst being oblivious to such things as deranged flatulence, trouser accidents, drooling.
Other terms could be "spaz" "spaccer" "spacker" "joey" "retard" or "mong"
Nip down to a 'special hospital', community centre, or Bury in Lancashire to see many wonderful examples of mitmots.