It's that look you get when you tell folks how far you've ridden. It's pretty typical to get the look from people who do not ride.
I was out doing a long ride yesterday and was 50 miles from the house which was near my turnaround point. I'd seen a group of 4 riders up ahead and cranked it up a bit to catch up with them. Got to talking and they were from a neighboring town doing a nice loop. They figured I was from the area as well.
When they found out I had pedaled over from 50 miles away......and had that much to get back out came the look.
The interesting thing is both of us had left out about the same time.