The word "车震" is formed by combining the character "车" (chē), meaning "vehicle" or "car", with the character "震" (zhèn), meaning "to shake" or "to vibrate". Together, they create a compound noun where "车" specifies the location and "震" describes the action, resulting in a literal meaning of "car shake". In usage, this term refers to the act of sexual intercourse inside a vehicle, inferred from the shaking motion of the car.