Garblizer turns normal, regular text into the sort of incoherent gibberish that so many angry people on social media write in preference to clear written communication. A number of modules are available to turn the input text into corrupted angry ranty lunacy.
Garblizer even has a Git Repository.
Insert your text and choose which Garblizer modules to include, and how much they apply to the text. 0.2 is a recommended setting for all of them, too high and the text becomes too incoherent, too low may not be as funny. Just experiment, this isn't an exact science!