someone who tries to be very orginal all the time and is obssesed with avoiding cliches and keeps correcting other people's words as he/she cannot stand cliches used by them, so his/her life seems to be devoted to the anti-cliche crusade only (the term refers to the character of don Quixote - the main protagonist of "The Ingenious Gentleman Don Quixote of La Mancha" by Miguel de Cervantes);
Jerry: Mary said she would not get back to the modern poetry classes.
Craig: Why not?
Jerry: When she showed her poem to the teacher, he threw her out of the room for using some of the phrases. He claimed her poem was a bunch of cliches.
Craig: What a don Clichote!