This sound is from Mikasa Ackerman Soundboard

The Attack on Titan manga and anime series feature an extensive cast of fictional characters created by Hajime Isayama. The story is set in a world where humanity lives in cities surrounded by enormous walls a defense against the Titans. It is later revealed that the area where the Walls are located is called Paradis.
See also: Mikasa, Attack on Titan (TV series), Yui Ishikawa, Attack on Titan (film), Attack on Titan (season 1), and Trina Nishimura.