This sound is from Oberyn Martell Soundboard - Game Of Thrones

Oberyn Nymeros Martell, nicknamed the Red Viper, is a fictional character in the A Song of Ice and Fire series of epic fantasy novels by American author George R. R. Martin. Introduced in 2000's A Storm of Swords, Oberyn is the younger brother of Doran Martell.
See also: Two Swords (Game of Thrones), Game of Thrones (season 5), List of Game of Thrones characters, List of Game of Thrones episodes, Arianne Martell, Gregor Clegane,