The act of cats or kittens acting like kittens and performing kitten-like behavior.
"Does your catJack usually kneed and suckle on fluffy blankets like that?"
"Oh, Jack and Sidney do behaviors like that all the time, they are just kittening. Like earlier today they were both trying to cuddle and sleep in the bathroom sink, but they don't reasonably fit in there anymore. They are just performing kitten-like behavior, kittening per se."
Following the change by PETA to rename the animals formerly known as "Fish" into the new name of "Sea Kittens", this is the modified term used when catching said animals in replacement of the old term of "Fishing"
We are going to head out to do some Sea Kittening for dinner tonight.
The act of kittens, who aren't quite old enough to know better, trashing up an environment when left unsupervised for too long. May also refer to the act of cleaning up after said kittens.
"The kittening that took place while we were gone for the weekend was extreme. We'll be cleaning all week! I can't believe they shredded every spare roll of toilet paper in the pantry. How did they open the door in the first place??"