The term 'automobile nut' is often used to describe someone who is passionate about cars and loves to work on them. The crossword solution for this term is 'LUG, ' which is an abbreviation for a LUG nut, which is a type of nut used to secure a wheel to a vehicle's axle. LUG nuts are essential components of any automobile, and they must be tightened to the correct torque in order to ensure the safety of the vehicle.