This is a term typically used to describe the irrational scum of the internet.

Its singular form (Dirty Dog of the Internet) can be used as just a general term to describe a particularly frustrating individual online, an insult directed towards a person, or as a normal, profane term.

Its plural form (Dirty Dogs of the Internet) can be used to describe a group of individuals on the internet that are generally seen as annoying, or can just be used as a normal, profane term.
"This dirty dog of the internet is a living logical fallacy with all his incomprehensible bullshit."

"<annoying social media site> is a group of dirty dogs of the internet!"

"Shut up, you dirty dog of the internet!"

*stubs toe* "Dirty dog(s) of the internet!"
by Sweggins June 18, 2015
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