Place this clip at the reveal in a reaction edit, right after the buildup goes quiet. Follow it with the run vine sound button for a chase gag, or let the bruh soundboard button answer it when the moment flops.
About this sound
This is a 6.5-second clip of a young kid reacting to Snoop Dogg with one long, stretched-out 'hooooo' that keeps going. The voice is high, loud and completely overwhelmed, which makes it feel funny and joyfully shocked at the same time. It comes from a Vine video of the moment the kid saw Snoop Dogg.