Wiktionary
hog wallow
n. (context US English) A shallow depression denuded of vegetation and potentially muddy, created by the wallowing of hogs.
Usage examples of "hog wallow".
In the open space around the depot, the soft ground had been cut and churned by the constant flow of traffic in and out until it resembled an enormous hog wallow, and here and there vehicles were mired to the hubs in the ruts.
According to the information she was pulling together, there wasn't a private inn anywhere on the planet that was better than a hog wallow.
Two braves stood not far from the hog wallow for a moment, but then mounted and loped off, probably to seek more victims.