Spanish Slip Up

"We had to do a verbal test in my Spanish class recently and the assignment was to give a speech about someone in the class. I decided to do a speech about our teacher to see if she would give me extra points for the assignment. When it was my turn I accidentally described her as 'fat' instead of 'skinny' and she made the most horrible face at me, and I couldn't figure out why until my friend told me after class about my mistake. I felt so bad and I was so embarrassed!"
Jill, 13