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Colloquial term referring to a laugh characterized by high pitch, brooklike quality, and repetition of a set tonal sequence.
"Ah HA ha ha ha ha Ah HA ha ha ha ha Ah HA ha ha ha ha" Note rising and falling pattern.

"Listen to that girl's desuma!"
"Dang! You can hear Tanya's desuma from all the way down the hall"
by Jed Bartlet April 14, 2007
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