It probably means you are getting very exited and you have an excess of adrenaline and other naturally produced stimulants in your system spurring you on.
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Shaking when you kiss someone could be a physical response to strong emotions like excitement, nervousness, or arousal. It may indicate that you have strong feelings for the person you are kissing, or that you are feeling overwhelmed in that moment. It is a common physiological reaction to intense or new experiences.