"Leeroy Jenkins" is a popular internet meme that originated from a video of a group of players in the game World of Warcraft. In the video, a player named Leeroy Jenkins charges into battle without coordinating with his team, leading to their defeat. His enthusiastic but reckless behavior became iconic, symbolizing impulsiveness in gaming. The video was uploaded in 2005 and quickly gained traction, becoming a cultural reference beyond gaming. It highlights themes of teamwork and the consequences of acting without a plan. The phrase "Leeroy Jenkins" is now often used humorously to describe similar situations in various contexts.