I hate the whole "trololol" song thing... mostly because to me it sounded and still sounds nothing like "trololol"
Although I know nothing of this, I could easily guess that people know "troll" as a word, and the song is annoying to some people, so they use it to annoy them as a troll. Then they change their word "troll" to SOUND like it, calling it "trololo." Who told you it literally, directly sounded like that?