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A gnatville ist the time a 'person'(1) needs to completely and utterly annoy you. This usually done by the habit of discussing telbastas (q.v.), or more commonly known as 'beating a dead horse'.
(1) And 'unpersons', according to George Orwell's '1984'.

A fact that is set in stone. It will not be changed, whatever you do. Don't even think of arguing to change a Telbasta. A Telbasta will be changed when hell freezes over.