A "Boys Impostor T-Shirt jersey," in short, sounds like a short-sleeved T-shirt for boys featuring a design related to the popular game "Among Us," where players try to identify the impostor among a group. The term "jersey in short" might imply that it's a casual, comfortable garment suitable for everyday wear or casual occasions. This kind of shirt could be a hit with fans of the game or those who enjoy playful and trendy graphic tees.