whipperness

A state of being where someone is being especially cute, funny, or exhibiting characteristics that only they or the people closest to them would have. Usually used between very close relationships to show love, or to make fun of in a caring way.

Christopher: Hehe, I got a new coat! I got a new blue coat! Yay!

Hailey: Oh my goodness, there is such big whipperness going on over here.