Okay, you know what you do? You buy yourself a tape recorder, you just record yourself for a whole day. I think you’re going to be surprised at some of your phrasing.

He means the grandparent made him laugh so hard, he spit out the food he was eating. It's a compliment, not a criticism.

Whoosh...

I've gotta say, I didn't even notice the double-serving hilarity of the phrasing before the parent pointed it out.

It's a quote from Arrested Development. You should check it out if you haven't seen it, it's on netflix and hulu.

Thanks for the reminder! I was just saying the other day how I still missed it so long after its TV run, I had quite forgotten that one.