What is Back It Up, Beep! Beep! Beep!?
1.
To ask someone to repeat something which needs clarification.
Jerry: She said there's some tractor story that she hasn't told me about.
George: Woah, back it up, back it up, Beep! Beep! Beep! Tractor story?
Jerry: Beep, beep, beep? What are you doing?
See