It's based on the superstition that burning ears mean someone's talking about you. Out of the blue, I started feeling my ears burning, and later I found out my friends threw a surprise party for me.
Pro Tip 2/3
Figurative Sense
It doesn't involve actual heat—it's about sensing you're being discussed. Whenever I miss a family dinner, I always feel my ears burning back at home.
Pro Tip 3/3
Social Situations
Use it when explaining a hunch or intuition about others talking about you. I walked in late to the meeting and felt my ears burning—the topic had to be my punctuality.