Bill Walton, of course, was a huge P12 homer having played at UCLA.

In 2021 during March Madness, the P12 was having a lot of success early in the NCAA tournament. He basically called everything outside of the P12 a truck stop.

Here's the quote from a Seattle Times article:

And then there are the “truck stops.” It’s a phrase Walton uses often, and it seems to be shorthand for the basketball world outside the paradise that is the conference of champions. Asked why he thinks that the rest of the basketball world didn’t recognize the prowess of the Pac-12 like he did, Walton responded, “I think those are questions better suited to the NCAA and to the people who are promoting truck stops.”

What constitutes truck stops, I asked? All the schools not in the Pac-12?

“Most of them,” he responded. “Not Gonzaga. I’m a huge Gonzaga fan. I’m a huge Timothy Egan fan. We’ll leave it to the reader’s choice who the truck stops are. We are the conference of champions. There are no truck stops here.”