BFF

O:  "Sandy is not Sarah's BFF anymore."
Mommy: (WHAT?! Who is Sandy and Sarah and did my 6 1/2 year old just use the term BFF?!)
"What does BFF mean O?"
O: "Best Friend Forever."
Mommy: "Right. Where did you learn that term?"
O: "CK"

OMG, my 6 1/2 year old is using BFF.