Father-Daughter conversation

A girl says to her father, "Dad, my boyfriend told me something that I don't understand. He said I have a beautiful chassis, nice airbags, and a great bumper. How should I respond?"

The dad replied angrily, "Tell your boyfriend that if he opens your hood and tries to check your oil with his dipstick, I will tighten his nuts so hard that his headlights will pop and he will start leaking from his exhaust pipe!"