Use it to close a short argument edit, with the setup before it and a reaction shot after it. Pair it after the Bruh sound for a double dismissal, or put Emotional Damage first when an excuse fails and let this line finish the exchange.
About this sound
This short German voice clip, about three and a half seconds long, has a man delivering the blunt line einfach mal die Fresse halten in a flat, annoyed tone. It feels rude, fed up and instantly dismissive, like a telling-off that needs no reply. The bluntness is the joke, making it work as a sharp reaction when someone keeps talking.