When my wife mentioned the "fat quarters" in her sewing room, I was thinking something chocolate-covered like raisins or cherries. I took a brief look in the room where she works the magic with cloth and I couldn't find any.
Then she educated me about how fat quarters are a yard of cloth cut in four pieces. Now I know. She has a collection of fat quarters for grandkid sewing projects.
I'm a lifelong learner. It's a continual adventure.