If someone offends someone, their immediate reaction is sometimes letting out a kind of unvoiced aspirated glottal plosive. I am not sure if that's the right term, but it feels plosive, aspirated and unvoiced, and it feels like its coming from the part of my throat that I use to produce glottal sounds. For people that are a bit more dramatic, the sound may be voiced. I feel like the unvoiced version is more a judgmental sound (ie. how distasteful it is for you to say that), whereas the voiced one is more of a whiny sound.
I am afraid making this sound might not be as widespread as I think, but it is definitely something we do in Norway.
I'm wondering what the English, non-technical word for what that sound is, or the word for the act of making that sound.
EDIT:
A way you might be able to construct an approximate sound is by taking "ugh", removing the "u" and shortening the sound you're left with. Then, try to move that sound further down your throat. That'll get you something along the lines of what I'm talking about.
EDIT 2:
I will try to add more clues to this puzzle by describing how it feels to produce the sound. Greybeard's ahem/harrumph suggestion (like the ugh suggestion) gets the location down to some degree. The ugh suggestion is wrong because its voiced and has a vowel, and Greybeard's suggestion is wrong because it is far more harsh (and also, the sound I'm talking about is monosyllabic and not typically repeated).
The ahem/harrumph noise feels like a scraping pop somewhere in your throat. The noise I'm talking about feels like a soft pop in the glottal area.
EDIT 3:
Just to be extra clear, this is what I suspect the sound to be, phonetically transcripted:
ʔ̥ʰ