a. A symptom that usually plagues males between the ages of 10 and 30 causing them to be unable to disassociate the game "Call of Duty" from reality. The game "Call of Duty when chronically played can cause a disorder of the mental process including a state of confusion, personality changes and impaired reasoning.

b. Those who play "Call of Duty" in a persistent and recurring way tend to start believing that they are part of a military organization, With their mental state in disarray they tend to believe what they do in game is all real and that they have actually done the feats that their avatar or character in game has accomplished.
Example a. Excerpt taken from real person suffering from Call of Duty Syndrome who threatened a YouTube personality

a. "What the fuck did you just fucking say about me, you НO0ОଠOOOOOОଠଠOoooᵒᵒᵒᵒᵒᵒᵒᵒᵒ? I’ll have you know I graduated top of my class in the 👌👀 good shit go౦ԁ sHit👌 academy, and I’ve been involved in numerous secret raids on 👎Baaddd ShIT👎👎👎 👎, and I have over 300 confirmed (chorus: ʳᶦᵍʰᵗ ᵗʰᵉʳᵉ)👌👀. I am trained in 👌👀👌👀👌👀👌👀👌👀 warfare and I’m the top shiter in the entire US armed mMMMMᎷМ💯 👌."

Example b. Person(s) talking about suffering perosn(s)

b. "Tim lost it, he is always on the look out for IED's and told me that he has over 300 confirmed kills with an RPG, yet he has never been in the military... I think Tim is suffering from Call of Duty Syndrome or COD Syndrome."
by Braotis March 17, 2016
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