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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 .
A quick Twitter search for the phrase I ship them will show you just how widespread the term has become, with thousands of people all over the world tweeting about their favorite couples. Kids often use the word when talking about [characters from] TV shows and movies, but it's also become a slang term for describing any two people that you want to get together, Michael explained. In a sense, some people were shipping over 100 years ago, according to Know Your Meme. They just weren't calling it that. In 1913, the book Old Friends, New Fancies featured characters from Jane Austen's Pride and Prejudice re-imagined in new relationships.