Braburn was passing by and saw this exhausted mare toiling in her field. Being a gentleman, he approaches Carrot Top to help her. As he approaches, he can't help but notice her very short, shorts...
Now, Carrot Top is a lady, but when it comes to working in the field, she tends to go with whatever is most comfortable, and in this heat a pair of slightly immodest shorts are the only thing to wear.
As Braburn nears he sees that as Carrot Top (already on her hooves and knees) bends down to pull a carrot, the bottom of her shorts ride up just enough to expose her cutie mark. Not all of it. Just the bottom portion of her mark is in view, but it's enough that he can tell what it is.
Without a word, Braburn joins in the labor and Carrot Top lets him. For a long while they work together in silence. The heat of the day is not conducive to conversation, but when the work is done and the last basket of Carrots is being jointly carried, Braburn quips, "Nice carrot".
What "Nice carrot" really means is, "You probably already know this, but just in case, when you work on the ground your shorts ride up quite a bit. Oh, and I think you are a very attractive pony, and am not afraid to admit that I noticed your body. I would like to get to know you better."
Carrot Top can't help but blush and smile at the stranger. She doesn't say anything. Which really means, "Yea, I know that these shorts ride up while I work, and I should probably wear something else. Oh, and I'm flattered by your bold compliment, and find myself attracted to you. I'm glad that you are so honest as to admit that you notice a mare's body where most colts would pretend not to. Let's get to know each other better".