Or was that just a regional thing? I grew up in Boston, if that matters.

It's funny, I haven't used that term in decades, haven't even thought about it. Then the other day, I was walking our dog and stepped on his shoe's heel (it's extremely hot on the pavement here in Arizona, so it's shoe-wearing season), and the shoe popped off. Without even thinking about it, I went, "FLAT TIRE!" and laughed.

Then, a minute later, after my wife caught up to us after a convo with a neighbor, she saw me putting the shoe back on and asked what had happened. I said I stepped on his heel, and she immediately went, "You flat-tired him??"

I just found it funny that we both immediately went back to that terminology.

Aforementioned goofball, with all tires properly "inflated" 🤣