Wiktionary
n. (context informal English) a high-performance hatchback motor car
Wikipedia
Hot hatch (shortened from hot hatchback) is a high-performance derivative of a car body style consisting of a three- or five- door hatchback automobile. The performance upgrades of a hot hatch are sometimes available for the estate variant of the car, often called sportwagons.
Vehicles of this class are based on family-oriented automobiles, and are equipped with an uprated more powerful internal combustion engine, improved suspension, and may also include additional "aerodynamic" body parts and larger wheels and tyres. Front-mounted petrol engines, together with front-wheel drive, is the most common powertrain layout, although some can be specified as diesel-powered, and rear or four-wheel drive hot hatches are also available.