This sentence is from the theme song of an animated series called Kung Fu Panda: Legends of Awesomeness. You can find it on YouTube.
I found this question here: "A little something something"? but I don't think that the meanings listed there fit in the song. This Wiktionary entry and this Urban Dictionary entry didn't help either.
However, this Urban Dictionary entry might fit in the lyrics:
"Something something" means that whatever the person is talking about isn't worth clarifying.
I also found a TV special of Family Guy called "Something, Something, Something, Dark Side" which is a parody of Star Wars. But I don't think that the songwriter wanted listeners to think that the series is made up of repeated ideas and things not worth mentioning. I can't think of another meaning, though.