Define... "Caught Red-handed"

I had tuition with my lovely p4 class on Tuesday. A word that I had to explain to them was "caught red-handed". How would you go about explaining the term to someone? I said something like this, "For example, if you are stealing something and someone witness what you are doing, you are 'caught red-handed'."

My student replied... "Ah! I know. So if I'm going to the toilet and someone sees me, I am caught red-handed." I was laughing inside but I had to stay cool to explain to her. Ha! She is cute man. I enjoy having conversations with her... So CUTE!

-LeB-