Mudflap Girl is an iconic silhouette of a woman with an hourglass body shape, sitting, leaning back on her hands, with her hair being blown in the wind. Wikipedia

An iconic silhouette of a woman with an hourglass body shape, sitting, leaning back on her hands, with her hair being blown in the wind; typically found on vehicle mudflaps, clothing, and other items associated with trucking in the United States. Wiktionary