1
It means you're so dumb you could fall off a cliff and still manage to trip on your own face
My cousin tried to fix the Wi-Fi by yelling at the router. Earth head moment. #facepalmdrop
I tried to explain algebra to my dog. He looked at me like I was a weird human. Earth head confirmed.
My friend tried to cook a burger. It looked like a science experiment gone wrong. Earth head, baby.