The phrase you might be looking for is "Je suis grande et petite" which means "I am tall and small". This phrase is often used to describe someone who is of average height, or to express a feeling of being both physically tall and feeling small in some way.
Here are some possible interpretations of the phrase "je suis grande et petite":
* Physically: The person is of average height.
* Metaphorically: The person might feel both strong and vulnerable, confident and insecure, or powerful and insignificant.
* Ironically: The person might be tall but still feel small in comparison to others, or they might be petite but feel confident and strong.
It's important to note that without context, it's difficult to know the exact meaning of "je suis grande et petite."