C-Moon is a phenomenon where the gravitational pull of a large area is suddenly flipped in all directions from a certain point. It's very rare and has only been recorded to have happened in one place, Cape Canaveral, Florida. It also seems that the point at which gravity was flipped in the opposite direction was a man, and touching him during that time would turn the part of your body that touched him inside out. He seems completely sane after this event.

When you eat dirt for the first time and leave your family to build a shack in the woods

C Moon represents a circle, a c and a moon. It means "cool" or "hip" and it's the opposite of L7 which is a square.
It was made famous by Paul McCartney and Wings.

It is commonly mistaken for "Semen" when said with a british accent.

The act of inverting someone inside out and defying gravity.

a gravity defying green boi