This was a Balderdash moment...
We're driving down the highway, and I reach back and tickle Tre's leg, repeatedly.
He is laughing the silent laugh.
He finally says, "You are making me jikser sick!"
Me recognizing this "term" as he uses it occasionally...
"What is jikser sick?"
Tre responds in an ever-so matter of fact tone,
"When you tickle me so hard I can't breathe and then I get the hiccups."