Freud's term for these was "faulty action" (Fehleistung), for which his editor/translator adopted the pseudo-Greek scientism parapraxis. The colloquial label is "Freudian slip" -- and as we'll see, the old man found some beauts. Freud's fascinating 1901 book on the subject (The Psychopathology of Everyday Life) distinguishes errors of speech (Versprechen), memory (Vergessen), and action (Vergreifen). In every case there is presumed to be an unconscious determinant of the faulty action, which can sometimes be inferred directly from the context. The most (in)famous example of such slippage is, of course, "Herr Aliquis" (full text).
Freud was not the first to happen upon this class of tricks our psyches play on us. Consider, for example, Shakespeare's Portia's revealing advice to Bassanio, to whom she wishes to declare her love, while knowing she must not:
Portia I pray you, tarry: pause a day or two Before you hazard; for, in choosing wrong, I lose your company: therefore forbear awhile. There's something tells me, but it is not love, I would not lose you; and you know yourself, Hate counsels not in such a quality. But lest you should not understand me well,-- And yet a maiden hath no tongue but thought,-- I would detain you here some month or two Before you venture for me. I could teach you How to choose right, but I am then forsworn; So will I never be: so may you miss me; But if you do, you'll make me wish a sin, That I had been forsworn. Beshrew your eyes, They have o'erlook'd me and divided me; One half of me is yours, the other half yours, Mine own, I would say; but if mine, then yours, And so all yours. O, these naughty times Put bars between the owners and their rights! And so, though yours, not yours. Prove it so, Let fortune go to hell for it, not I. I speak too long; but 'tis to seize the time, To eke it and to draw it out in length, To stay you from election.
She loves him. . .
She loves him not. . .
Now, if you like, identify and explain a Freudian slip of your own, and post it to the Web discussion.