The "dooooon" is probably a jojo reference. It's the sound effect used for when Dio "teleports" or appears suddenly because he stopped time.
bulgenom★ Whoever can eat three taiyaki faster is the winner.Aaand GO!Wha--!?nomwipeHey! Did you really eat them!? If you wasted food, I'll kill...I didn't know you had it in you...homuhomugoooong