Place it as the final beat after a failed plan or awkward argument, following a Bruh for disbelief and then letting it close the scene. For a bigger reaction, put an emotional damage sting after it, so the dismissal lands first and the overreaction follows.
About this sound
This 14-second Thai voice clip says chang mae man, a casual way of saying whatever or never mind, in a relaxed, dismissive tone. It feels carefree, cheeky and unbothered, like a spoken shrug for moments when explaining yourself feels like too much effort and moving on feels better.