Place it at the exact reveal point in your edit, then follow it with goofy ahh sounds for a second hit. If you want a bigger closer later, save the fart with reverb for the final callback instead of stacking both together.
About this sound
This clip is a 12-second meme fart gag built around a watermelon, presented as if the fruit let one rip in a photo. It lands as pure lowbrow silliness, the kind of stupid, unexpected noise that turns a normal picture reveal into an instant joke.