Seraph has since learned how to make kissing sounds with just her lips. So, she doesn't say it anymore. However, it's become traditional in our family to say, "Mmmmmmmmaaaah!" (even without the kiss) as a loving greeting or farewell.
"Love you, Mom, mmmmmmmmmmaaaaaah!"
"Goodnight, sweetie, mmmmmmmmmmaaaaah!"
"I'm going over to Jeff's house - mmmmmmmmmaaaaah!"
"Have a good day at school! Mmmmmmmaaaaah!"
"Missed you! Mmmmmmaaaaaah!:)