surprisingly, dates from 1964!

British
: a person who pretends to be an intellectual
short for pseudo-intellectual
First Known Use: 1964
[M-W 11th}

edit: and, of course, OED has the apposite citation..

1964 Spectator 20 Mar. 379/1 The pseuds and intellectual craze-mongers seem to have dropped cinéma-vérité almost as quickly as they took it up.

but it was adjectivized even earlier..

1962 Spectator 26 Oct. 656 Present-day trend-setters, pseud as they come.

Last edited by tsuwm; 02/12/2012 8:20 PM.