Free burp app to play pranks on family and friends FREE burp app to play prank39;s on friends and family. 8 burp sounds to choose from.One of our favorite features of Hippo BURP39;s is the Time Delay. Set the delay from 05 min and choose any burp. You place your phone near an unsuspecting friend and watch the fun begin.Now go, have fun and LET IT BURP