Useful word

The other day, I was tickling Chase. He said, "Mom, you have to stop tickling me because I'll get turberind!"
I said, "What is turberind?"
He looked at me like I didn't know anything and said, "It's when I am laughing so hard that I roll over, roll off the bed, and fall on the floor!"
Of course! I wish I had known the word for that long ago...