Let me break it down. "Tremors" refers to the TV show or maybe earthquakes. "I saidub" could be a misheard version of "I said." "Top" is clear. So maybe the user meant "Tremors I said, Dub Top". That doesn't make immediate sense. Alternatively, maybe they intended "Tremors I said, Dub Top" as in something related to a YouTube video or a dub version of the show.