What Did You Say?????

As we were driving home from shopping yesterday, we stopped in the left turn lane at a red light. We were behind a car at the light and the cars going straight had a green light so they were zooming by us. Across the intersection there was a lone car, in one of the two turn lanes, waiting for the light to change.

A says: What a sucker!
Momma replies: What are you talking about?
A states: That car is stuck, all by itself. What a sucker.

Any ideas as to where he got this new expression from?