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ワクワク wakuwaku
Fizzy excitement before something fun.
What does wakuwaku mean?
The good version of dokidoki: no fear, just anticipation. Trips, concerts, a parcel arriving tomorrow.
Example
明日の旅行が楽しみでワクワクする。
I'm so excited about tomorrow's trip.
Vibe
Who you can say this to, and how it lands.
Safe to use Fine in ordinary conversation.
The story behind wakuwaku
The usual explanation ties it to waku, the verb for water welling up from a spring, and the image fits: something rising in your chest that you did not open a tap for. Wakuwaku is anticipation with no fear in it, which is what separates it from dokidoki. Trips, concert tickets, a parcel that ships tomorrow.
Because it is pure upside, institutions love it. Schools, ad campaigns and company slogans all promise wakuwaku experiences, and after enough posters the word can feel a bit corporate. It survives anyway, mainly because children use it honestly and adults never quite stop. Say it about a plan and you have admitted, cheerfully, that you are already excited.