Yumi Syndrome
(yuu-mi sin-dro'hm)

noun.
A neurological disorder where all of one's surroundings seem worthy of ridicule or derision; preposterous; laughable: a Chinese accent. Has been defined as a psychogenic illness distinguished by emotional incontinence or lability by the Department of Health. Characteristics of this pattern of behavior include insane laughter, tears and an exaggerated facial expression. A person experiencing Yumi Syndrome will often find it in their best interest to momentarily excuse themselves from the room or place of meeting if they feel they may experience an episode.

Origin:
2011–08; < Neo-Latin < Greek yumi syndromḗ concurrence, combination, equivalent to syn- syn- + drom-, base meaning “run” ( see -drome) + -ē feminine noun suffix

Synonyms
nonsensical, ludicrous, funny, droll, comical, farcical. See Pseudobulbar affect or the Tanganyika laughter epidemic.

Antonyms
sensible, mature, composed
"Observe how the subject is unable to contain her laughter or other displays of emotion. Hysterical neurosis is typical of stage one Yumi Syndrome."
by Very Concerned Friend August 24, 2011
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