had had meaning
‘had had’ is the form of Past Perfect Tence of the verb ‘to have’.
It is quite often used in the reported speech, for example:
He said that he had had that book before.
I didn’t know that word had had such a meaning 20 years before.
You can find some interesting facts about the English grammar in my courses in the library here like ‘Step by step’ and ‘English grammar and vocabulary’.
Good luck with English!
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You may also read about this ‘crazy’ phrase here: James while John had had had had had had had had had had had a better effect on the teacher - Wikipedia
Maybe it will help you to understand the usage of ‘had had’.