Suburban house that is actually a concealed indoor marijuana plantation. Grow-ops are usually loaded with high intensity lights for the crop, and often have illegally bypassed electrical meters, both to reduce costs and to prevent their detection by electrical consumption. They are often detected because of their heat -- either via infra-red thermography, or in colder climates, because snow melts on the roof faster than on other houses in the neighborhood. Some larger scale grow ops are installed in larger industrial buildings, rather than in residential areas.
The term is in common use in suburban Canada,
You know that suspicious house down the street? The cops raided it today -- It's a grow op!