You’re probably wondering why Finding Nemo would need to be censored. It’s a Disney movie. There’s nothing risqué at all about a Disney movie (except that one where Walt inserted the naked woman, which I believe was Lady and the Tramp).
That’s just it. Finding Nemo does not need to be censored… except for the sake of comedy. When you censor certain words, as you’ll see, the viewer’s mind just inserts an expletive. That gives the dialogue a whole new meaning and makes it hilarious.
The censored video was produced by Jake Vale. You can see more of his work here. There’s also a censored version of Frozen, as well as a bunch of prank videos.