Anonymous have asked people to mock Daesh, also known as ISIL, by posting satirical online memes and uploading pictures of its dead fighters.
The trolling day, to be held on December 11, is part of the group's "Operation ISIS" launched after Anonymous declared war on Daesh in the wake of the Paris terror attacks.
On top of mocking Daesh, Anonymous have also called on people to try and disrupt the jihadist group's online communications techniques and propaganda tactics.
Anonymous say the idea behind "Operation ISIS" is to fight the "fear" the group is spreading.
"You may be wondering why we are 'trolling' Isis [Daesh] and planning all these demonstrations against Isis," the group's post reads. "But to understand that you must first see how Isis works.
"They thrive off of fear they hope that by their actions they can silence all of us and get us to just lay low and hide in fear. But what many forget and even they do is that there are many more people in the world against them than for them. And that is the goal of this mass uprising…
"On December 11th we will show them that we are not afraid, we will not just hide in our fear, we are the majority and with our strength in numbers we can make a real difference. We will mock them for the idiots they are."
Anonymous have set up guidelines for people looking to take part in mocking Daesh, with recommendations on how to utilize Twitter, Facebook, YouTube and Instagram.
However, the action won't be restricted to online activity, with Anonymous to hold meetings in many cities around the world, encouraging people to "make stickers of mocking photos" to then "put around your town" as well as "print out pages showing how Isis does not represent Islam."
They have also called on people to publicly identify supporters of the group.
The coordinated attack is the latest in a series of online attempts to discredit Daesh and subsequently, destroy the jihadist group's appeal towards young Westerners.
Anonymous recently started reporting the social media accounts and leaking the information of Daesh supporters, while online trolls mocked the group by adding images of rubber ducks to their photos.