When someone is kiding, they are making a joke. They are not serious.
Sometimes, when they say they are kiding, they are not really kiding. They are trying to make a suggestion:
Speaker: "Kiding, but not kiding."
Recipient: "You gotta be kiding" - this means that you don't accept a statement the speaker said.
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'kimochi' (気持ち) is a Japanese word meaning 'feeling', 'mood' or 'sensation'. A good feeling could be 'kimochi ii' (気持ちいい) and a bad feeling 'kimochi warui'