The personified laugh of a snake. This type of laughter is often performed as a courtesy laugh. See definition of "courtesy laugh"

The snake laugh is traditionally performed by emitting three short "s" syllables.
Person telling moronic joke: "...to get to the other side!"
Person snake laughing: "Sss sss sss."
by LanceLanceLance August 16, 2011
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When your friend has a weird laugh that sounds like a snake
Triston: "Bro, here comes Bryson. He has a weird snake laugh."
Drew: "Hey Bryson, you lookin hella cute today."
Bryson: "Tss tss tss tss"
by Idrv64s February 6, 2020
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