BBD (Big Buck Down) is an expression commonly used in the hunting community to announce the successful harvest of a large male deer, typically a buck. The term is often used to celebrate the accomplishment of hunters who have successfully tracked, hunted, and harvested a mature buck with impressive antlers. The phrase is commonly shared among hunters on social media, in hunting camps, or within hunting circles to highlight a successful hunt and the accomplishment of harvesting a trophy-sized deer.

The "big buck" referred to in the expression is usually a mature male deer with well-developed antlers, which are considered a symbol of the animal's age, health, and genetic quality. For many hunters, bagging a big buck is a major goal, and the "Big Buck Down" announcement serves as a marker of that success. The expression reflects the excitement and pride hunters feel when they successfully capture such a significant and challenging quarry.

In addition to the celebratory nature of the term, "BBD" is often accompanied by photos of the deer, which are shared to showcase the trophy and the skill involved in the hunt. However, ethical hunting practices remain crucial, with hunters ensuring that they follow local regulations and respect the wildlife they pursue.