こーゆーの = こういうの = こういう事。 Notice that it's written as it sounds when it's spoken.
って is like は but used in conversation. It's used to refer to something previously mentioned. Ex: A「ななちゃん、可愛いね～」 B「ななちゃんって誰？」
だ is the not formal form of です.
っけ？is used when you are trying to remember something you are suposed to know and you look for confirmation. Ex: A「君の名前は何ですか？」→ What's your name? A「君の名前は何だっけ？」→ What was your name? (You probably told me but I can't remember)
Sumarazing: 花キューピットって Cupido flowers (?) *I don't know wth is this. こーゆーのだっけ? Was it something like this? *I'm gessing this person is showing something to confirm it.
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