jimjams

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The Word of the Day for August 8 is: 

jimjams   \JIM-jamz\   noun plural
     : jitters

Example sentence:
     "I love cappuccinos, but the caffeine gives me the 
jimjams," said Paula.

Did you know?
     When "jimjams" entered English in the mid-19th century, it 
probably referred to a specific kind of jitters -- the "delirium 
tremens," a violent delirium caused by excessive 
drinking. "Jimjams" is not particularly common today, but when 
it is used in current American English it means 
simply "jitters." Etymologists aren't sure about the origin of 
the term. Some speculate that it came about as an alteration 
of "delirium tremens." Others, though uncertain of the origin 
of "jim" and "jam," notice that the word follows a pattern of 
similar words in which one sound is repeated or altered 
slightly. Interestingly, other words for "jitters" were formed 
in the same repetitive way -- "whim-whams" and "heebie-jeebies" 
are examples.