A "fist bump" is a friendly gesture where two people lightly touch their fists together. It is often used as a greeting, a sign of agreement, or a way to celebrate a small victory. This gesture is popular in various cultures and is commonly seen in sports, among friends, and in casual social settings. The fist bump is considered a more hygienic alternative to a handshake, as it involves less skin contact. It has gained popularity in recent years, especially among younger generations, and is often associated with camaraderie and positivity.