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Similar to the phrase diarrhea of the mouth, but done exclusively via computer.
A person afflicted with diarrhea of the keyboard may send frequent, very lengthy emails, post multiple very long daily updates to his or her blog or website, or clog up internet BBSs (forums (or even fora if you want to be an ass about it).
{Tony}: When you're a computer geek playing games and invading dungeons, Jethro just doesn't cut it.

{Abby}: This guy has diarrhea of the keyboard. His blog must be 1,000 pages long.
via giphy
by Telephony April 25, 2017
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