A satirical joke assassin is an annoying ass person who doesn't know the difference between a real thing and a joke. Because of this, they will usually comment below posts that are obviously satire and comment saying that it's not real.(It obviously wasn't it was a joke) Usually they they the sentence with "Um...Actually."
Person: Gta strippers will pop out of the game and give u h*ad irl
Satirical Joke Assassin: Um...Actually, this this not true. This account is spreading misinformation about Grand Theft Auto VI. Sorry to anyone that believed this, (no one) and I'm looking out for you guys on the internet.