Noun: A collection of semen. A place where semen is collected.
Verb: For a group to ejaculate in a particular area.
Jonny added to his dog pile when he jizzed in his honey pot. (he stores his dog pile in a literal honey pot)
Jonathan has a dog pile on the floor under his computer.
Jonny brought a girl over for first time. Thats when Jamie yelled "dog pile!" and everyone in the house covered her with semen.