this sound. what is it?

I had a writing dilemma last night, and so I asked Twitter:
What is this noise?
It's like a rueful, smirky, one-note laugh. Almost a snort.
Some people said it was a chortle, but I'm not so sure.
What do you think?
I NEED TO KNOW WHAT IT'S CALLED.
Even if we have to make up a new word for it.
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