What`s the meaning of " my boo" like in the usher`s song?!

Question: What`s the meaning of " my boo" like in the usher`s song!?
Answers:

My lady, My girl, My sweetie etc!.Www@Enter-QA@Com

BOO : Words meaning boyfriend, girlfriend, boo, significant other -
Www@Enter-QA@Com

something like "my baby"Www@Enter-QA@Com

His girl, possibly his first loveWww@Enter-QA@Com

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