An aged but well maintained car, generally from the 1980s, that has been bought cheaply and lovingly restored to its former glory. Rusty Monkeys are typically bought cheaply (for less than £500) and restored to take part in charitable events, races, meetings or just for the fun of it.
Typical and popular Rusty Monkeys include the Audi Quattro, the old-style Ford Escort, the Ford Scorpio, the Trans Am and the original police Panda cars like the Ford Anglia.
Drinking down a forty ounce alcoholic beverage to a desired level (typically the bottom of the cone), then topping off your forty with Mad Dog 20/20. The same concept as a brass monkey, but a lot more disgusting.