dogpile
(colloquial) A disorderly pile of people formed by jumping upon a victim.
(colloquial) Any similarly disorderly pile of people or things.
(euphemism) A pile of dogshit.
(internet slang) The situation where many participants attack the same user (on a discussion forum or similar).
(computing) A cache stampede.
(often with 'on') To jump into a dogpile.
To pile on, to overwhelm in other senses.
(internet slang) For many participants to attack the same user (on a discussion forum or similar).