What is an aiyi?
What is an aiyi? Sorry I do not know the hanzi, I just heard someone say they spoke with their aiyi and the postman.

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all women that are younger than your mum.

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house helper / babysitter / female relative

阿姨 = ā-yí

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阿姨：you can call all of the women whose age are close to your mother's but who has NO blood relationship with your family.

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ayi 阿姨 ?  aiyi 爱意?

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Are you sure it is aiyi instead of another word “ayi”?
I do not know aiyi, either, but there is another word called "阿姨". This might helps.