3. mentally challenged
4. acting stupid - no common sense (effectively above)
Origin of word : Scotland, A77 (motorway)
Derived from Hansel Village which is a camp for the mentally challenged of which the the camp is strategically placed beside the motorway so that escaping 'hansels' are either killed or incapacitated by motor vehicles thus stopping them from getting into the outside world.
Noun: a Hansel
Abbreviation: Hans, Lance