The act of everyone piling on top of one person, such as in a football game where everyone dogpiles the one with the football.

Or another example is, everyone attacking one person, even though they weren't present, simply because one person is angry at them.

1. A rambunctious occurrance in which all people in a group who are rowdy and socially adept enough to perform it all throw themselves onto the ground in a big laughing pile.

2. A less rambunctious occurance in which one unwilling participant is buried in hundreds of pounds of human flesh.

3. A shout which precipitates either 1. or 2.

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Stacking two girls on top one another for doggystyle sex simultaneously so both their asses are facing you.