A pigsty is a shelter where pigs live on a farm, typically a fenced pen with a simple roof or shed where pigs can stay dry and sleep. Traditional pigsties had dirt floors and sturdy walls to contain the pigs, who would root around in mud and straw.

But when someone calls a room a pigsty, they mean it's extremely messy and dirty. A bedroom becomes a pigsty when clothes cover the floor, trash overflows, dishes pile up, and you can barely see the carpet. A kitchen might be called a pigsty when dirty pots crowd the sink, crumbs scatter across the counter, and nobody can find a clean fork.

When your parent says your room looks like a pigsty, they're making a vivid comparison to help you understand just how messy things have gotten. The word creates a memorable mental picture that's hard to ignore.