The term "picky eater" refers to a person who is very particular about what they eat and are often hesitant or unwilling to try new foods. They may have specific preferences for certain types of food, textures, colors, or flavors, and may become upset if their preferred choices are not available. Picky eaters can also exhibit behavior such as refusing certain foods, throwing tantrums at mealtimes, or taking very small bites to avoid trying new things. This term is often used to describe children who are fussy about their diet but can also apply to adults with similar eating habits and preferences.