拥抱的温度只有你清楚亲吻的感觉只有你知道
[yōng bào de wēn dù zhĭ yŏu nĭ qīng chŭ qīn wĕn de găn jué zhĭ yŏu nĭ zhī dào]
It means the warmth of his/her embrace and the feel of a kiss can only be truly understood and felt by the person mentioned, emphasizing an intimate connection between the two. This nickname showcases the privacy and exclusivity of a romantic relationship.