What does g-force mean in slang?

"G-force" doesn't have a specific slang meaning. It's a scientific term that refers to the force of gravity, often used in the context of acceleration or deceleration, especially in aviation and space travel.

However, it's sometimes used in a more colloquial way to express:

* Intensity or power: "That was a g-force of a performance!"

* Something overwhelming or intense: "The crowd's energy was a g-force!"

* The feeling of being pushed back: "I felt the g-force as the rollercoaster went over the hill."

While these are not standard slang definitions, the word is used in a casual way to emphasize the magnitude or effect of something.