This sound is from The Hound (Sandor Clegane) Soundboard

Sandor Clegane, nicknamed the Hound, is a fictional character in the A Song of Ice and Fire series of fantasy novels by American author George R. R. Martin. He is the estranged brother of Ser Gregor Cleagane, from the fictional Seven Kingdoms of Westeros.
See also: Gregor Clegane, Rory McCann, List of Game of Thrones characters, List of A Song of Ice and Fire characters, Oberyn Martell, The Broken Man.