In the quote from "Anna and the French Kiss" by Stephanie Perkins, the speaker is complimenting Bridge for having well-shaped and attractive buttocks. It reflects a moment of admiration or compliment toward someone's physical appearance.
The remark adds a touch of flirtation or lightheartedness, highlighting the character's focus on physical attributes. It demonstrates that the characters notice and appreciate each other's looks, contributing to the story's personal and character-driven moments.