A pile of mostly hairless mammals, pink or flesh tone in color. Usually resulting from a domino effect wherein one person jumps on top of another during a moment of vulnerability, then another on top of them and so on. The pile grows until the squealing of the poor soul on bottom grows to a fevered pitch and the pile crumbles apart.
Quick, jump on to that pig pile.
When a girl, a guy, and another girl (stacked in that order) are rapped up in a white sheet on the couch. The girl on bottom has a fuzzy in her vagina and the guy in the middle has to fetch it with his tong. Meanwhile the two girls are making out between his legs.
Pig Pile is Like a threesome but more intense and like a game.