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1.
A newspeak word invented by george orwell in his book 1984.

An oldthinker is one who clings to old or outmoded ways of thought. Orwell defines it as, "... typical sentence .... as 'Oldthinkers unbellyfeel Ingsoc'. The shortest rendering that one could make of this in Oldspeak would be: 'Those whose ideas were formed before the Revolution cannot have a full emotional understanding of the principles of English Socialism.' But this is not an adequate translation.....

Used by geeks in a perjorative way about anyone who is not techno-savvy.
"My Dad's a real Oldthinker - he won't even have a mobile phone !"

"Come the Revolution, all you Oldthinkers will be put up against a wall and shot !"
by Eighth of Seven January 14, 2007