Place it at the end of a gag, then follow it immediately with the Kiko laugh to sell the reaction, and open the next scene with the WhatsApp message sound to suggest the joke is still spreading.
About this sound
This is a single, very brief fart sound effect lasting less than half a second, with no speech or music, just the unmistakable bodily noise itself. It lands as crude, silly and instantly awkward, the kind of sound that makes a room laugh before anyone can pretend it did not happen.