It goes back to in the old days when girls called their boyfriends boa, which is pretty much calling them their boyfriend.
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There is no definitive answer as different couples have their own unique ways of addressing each other. However, "Boa" could be a term of endearment that some girls use for their boyfriends, possibly a shortened form of "baby" or "babe." It may also be derived from the word "boyfriend" itself, with the "bf" letters pronounced as "boa." Ultimately, it is a personal choice and can vary between individuals and relationships.