Found this video online of a little kid and for some reason, the guy filming asks him to list all the SWEAR WORDS he knows. So he does, and almost all of them are PG-13 words that start with "butt" . . . like "butt-head" or "butt-face." But then he comes up with one more word you're not expecting . . . the S-WORD.
(Search for "Tell Me All the Bad Words You Know." WARNING: He says the S-word, and also "butt-h**e" and "butt-crack.")