'Kokoro' means 'heart' ( the feeling/emotion not the body part ) in japanese, so when someone says ' my kokoro is brokoro' it means their heart is broken, or they are feeling down or heart broken.
person: i just watched the saddest anime ever
person: my kokoro is brokoro
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"Kokoro" is Japanese for heart, while "doki doki" is an onomatopeia for heartbeat. This phrase is often used ironically or in a humorous context to express admiration or love.
Person 1: My kokoro goes doki doki for you.
Person 2: What the fuck is wrong with you.
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Means the one who is in your heart.
Sean asked, Who's kokoro?
Sam answered, <3.