Saying "sheesh" after a kill or a clutch round has become a popular trend among players, and it's often used to express excitement or surprise at what just happened in the game. It's a way for players to show off their enthusiasm and energy, and it can also help create a fun and engaging atmosphere in the game. Some players may also use it as a way to taunt their opponents or show off their dominance. Whether or not you choose to say "sheesh" is up to you - it's not a requirement for playing the game, and there are plenty of other ways to express excitement and enthusiasm. Ultimately, the most important thing is to enjoy the game and have fun playing with others!