refers to playing the campaign mode of a video game (such as "Call of Duty" or "Halo") strictly to exclude someone who seeks to play online with others.
Can be expanded to describe any form of exclusion.
Richard: You guys are playing campaign mode just to exclude me!
Mike: No we're not!
Mike (in a private chat with another player): We totally are.
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To exclude someone from a group social activity, as one might do by playing campaign mode
Toby: Hey should I invite Ricky to the bar?
Winston: Nah, tell him we're not doing anything.
Toby: I guess we'll be playing campaign mode tonight
*Both high-five*
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