Bye-Bye Bee-bow

Hazel loves to say "bye-bye" to everyone.  Even total strangers in public.  Usually she just picks someone and looks at them and says bye-bye over and over until they acknowledge her.  Lately though she kept saying "bye-bye bee-bow" and I could not figure out what bee-bow was.  I'm usually pretty good at decoding what she says but some things take awhile.  Finally I was grocery shopping with her on Monday and she said it and I figured it out, bee-bow is people.  So I asked her "bye-bye people?" and she nodded her head excitedly.  And now that I've figured it out and corrected her a few times she's actually starting to make the "p" sound.