Place it as the final beat of a short rejection scene, right after the other person makes their last unwanted demand. Follow it with the Bruh sound as the next reaction, then let the scene cut away without adding another clip.
About this sound
This is a short Russian voice clip lasting about 1.7 seconds, with a single speaker delivering the blunt dismissal “Poshla nafig” in a flat, fed-up tone. It feels abrupt, rude and funny, like slamming a door on a conversation that has gone on too long. The bluntness is the joke: no buildup, just an instant shutdown that lands best when someone will not take the hint.