This sound is from Gravity Falls Soundboard

The series follows the adventures of Dipper Pines (Jason Ritter) and his twin sister Mabel (Kristen Schaal) in Gravity Falls, Oregon. The series garnered high viewership amongst kids, teenagers, and young adults during its run. It was Disney XD's highest rated show in 2015 and early 2016.
See also: List of Gravity Falls episodes, List of Gravity Falls characters, Gravity Falls (season 2), Alex Hirsch, Gravity Falls (season 1), and Gravity Falls: Lost Legends.