Goat stands for "Greatest of all time" / Micheal Jordan, Wayne Gretzky, Pelé.
You guys are so bad, compared to me because I'm a Goat
An alien claiming to be from Argentina who is said to be able to pass through people whilst carrying a round ball that is glued to his feet and he is able to detach it whenever he pleases. It is said that he is the successor of Diego Armando Maradona and the Greatest of All Time at the world's most popular sport, football.
The GOAT finally won the World Cup in 2022.