"Bug" is a slang term for which model of car?

The Volkswagen Beetle—officially the Volkswagen Type 1, informally in German der Käfer (meaning "beetle"), in parts of the English-speaking world the Bug, and known by many other nicknames in other languages—is a two-door, rear-engine economy car, intended for five occupants (later, Beetles were restricted to four people in some countries), that was manufactured and marketed by German automaker Volkswagen (VW) from 1938 until 2003. Although designed in the 1930s, due to World War II, civilian Beetles only began to be produced in significant numbers by the end of the 1940s. The car was then internally designated the Volkswagen Type 1, and marketed simply as the Volkswagen.

Source: Wikipedia