This phrase is used to describe someone who is about to be surprised or shocked. It literally translates to 'their eyes will be like a cow's going up a slope', suggesting wide open eyes due to surprise or fear.
Examples
- Spanish: Cuando vea el regalo, se le van a poner los ojos como vaca que va pa’ risco.
- English: When he sees the gift, his eyes are going to be like a cow's going up a slope – wide open in surprise.