"Doki doki" is the Japanese onomatopoeia for the sound of a heartbeat. It's used to imply nervousness.
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It's actually one of those words in japanese that describes a sound. "Doki Doki" is supposed to be the sound of a heart beating. The title is supposed to imply that your heart will race if you play the game because it's just that exciting.
EDIT: damn it Damn it DAMN IT I THOUGHT I WOULD BEAT KISHI TO IT FOR A CHANGE.
:aimsun: