Freudian Slide
A Freudian slip that lasts far too long to simply be a slip of the tongue.
Example #1:

Hey, can I borrow a pe-pe-penis penis penis Penis Penis PENIS PENIS VAGINA PENIS pencil please? Sorry, Freudian slide.

Example #2:

Woman: So what's your favorite color?
Man: Well, I think my favorite color's I'd like to bend you over my knee and spank your butt raw....I mean blue.