Peep.

This originates from a family trip during which we kids were being particularly loud, I guess, and Dad said angrily, “I don’t want to hear another peep outta any one of you!” to which Beth replied, “Peep.” Dad pulled the car over and gave Beth the only spanking she remembers to this day.

Just one of many smart-alecky things said by Gumnick children over the years. That’s what you get for having smart kids.