|1.||Back it up, BEEP! BEEP! BEEP!|
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?