15 : Bulletin Board – 1

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    1 : Old futaba channel thing believing to have originated in “Ochinchin land” threads. Whenever such a thread was created, replies like, “get on board ^^” or “yay ^^” would be guaranteed. It is implied that a naive shota type character would be saying this.

    2 : A cry from the soul expressing an joyous feeling, usually during criminal acts. It’s often used in Fist of the North Star by the minor enemies, you know, the outlaws with mohawks and leather jackets.

    3 : Said by Yajuu-senpai in the climax of the 4th part of Midsummer Night’s Lewd Dream. Amongst other things, it’s just used to express surprise.

    4: From part 1 of JoJo. A similar phrase is said by Dio’s goons during the kiss scene.

    5: ガタッ！？, an onomatopoeia that expresses a sudden noise. In 2ch, It’s usually used in this ASCII art,

    ( ?д? )　????

    .r　 ヾ

    ＿|| 　 /￣￣￣/＿

    ＼/　　　/

    I might’ve missed a few subtle ones, but these were all the references I could make out.