When a gang of posters who might not normally post at a board, all show up at the same time to attack another target poster.

Can also be used to refer to Photoshop Dogpile, which is a game in which a person takes an image and Photoshops a person or object into the image Then, the next person takes that newly edited image and Photoshops another person or object into the image. This repeats until the image becomes "full" and a new round is begun using a new image.

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