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Waku-Doki is the feeling of anticipation and that adrenaline rush you get when you are about to do some exciting. It's a feeling you cant really describe and is so intense that your heart beats faster and you are almost trembling with nervous excitement.

It is a Japanese word and is used in Japan as Waku Waku Doki Doki.
Wakuwaku = tremble, become nervous
Dokidoki = the sound of rapid heartbeats
My heart goes Waku-Doki when my car hits 150kmph.
I went completely Waku-Doki when I went skydiving for the first time.
by White_Wizard July 12, 2012
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