Dogpill

4chan slang that refers to a person who has a sexual attraction to dogs or engages in sexual acts with a dog. Not exclusive to one sex and meaning can differ depending on the context. Often accompanied by the phrase “you just know”.

On boards like /an/ it is commonly used to describe single men who own female huskies implying they have sex with them. In other boards like /b/ it is mostly used to describe white women with large male dogs with the same implications.
In the most extreme cases and boards such as a “feral art” thread on /trash/ in can mean the knowledge of an innate sexual superiority of dogs over humans.

A racist stereotype that white women have sex with dogs.

In some incel circles, it's said that women would rather sleep with dogs than with incels.

Some even claim that dogs are more attractive to women than even the best looking males.

A disagreement on an Internet message board wherein one person says something wrong or offensive, and a large number of people comment in response to tell the person how wrong and/or horrible they are, and continue to disparage the original commenter beyond any reasonable time limit.

People commenting at the same time, without realizing others are jumping on the person as well, do not make a dogpile. The requirement is to join in with an angry group to yell at an easy target, or to get popularity points for being seen to agree with the group. They see that everyone else is doing something, and they copy it.

The original commenter typically does not respond at all, because they are completely overwhelmed or scared off. Once a dogpile has been established, an apology from the original commenter is less likely to be effective.

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.

Fact that many women would rather have sex with a dog than an incel.

Encouraging your followers to harass (on twitter)

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.