Okay, just for ffx800:
Freudian slips are slips of the tongue where you accidentally say something related to sex instead of what you were actually trying to say. For example, if you were trying to say '3 1/2" floppy disks', but it came out as 'floppy dicks', that would be called a Freudian slip.
Read more about Freud if you want to know why everything about him was to do with sex (Oedipal complexes, penis envy, etc.).