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Keyboard Diarrhea 

The act of pressing multiple keys in a random order to symbolise excitement, shock, and other explosive emotions. Often reminds one of diarrhea due to the stringent rule of making sure that it sounds fluid.
Can also refer to keyboard warriors typing complete, and absolute, bullshit.
A Legend On Mangadex: You're so "the type" that even with that keyboard diarrhea you'd somehow managed to address nothing. Fuck off, I've had it with you insecure mensa rejects. Blocked.

diarrhea of the keyboard 

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.