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So don't worry so much about how to use  had had  as a unit of grammar, they will come together naturally when you want to express the verb ' to have ' in the past perfect. Let's consider a different verb for a moment like  to want .
Both when written in English look the same but are pronounced differently. 1  The first possible meaning is Decent, generally used for kids or marriageable guys (to highlight their character). 2  The second possible meaning is a lady (or sometimes used for one's life partner).