What is fraccing fluid?

That's a misspelling. It should be fracking fluid.

Fracking fluid consists of a lot of water, up to 600 different chemicals added, and sand.

Fracking is a slang word from the oil industry. It is used to refer to the process of hydraulic fracturing of oil-bearing rocks.

It's fracturing fluid, aka slurry. And it consist of fresh water, or produced water (water recycled from wells, you see what goes in must come out.). 600 chemicals is quite over the top. Jobs vary, there are different designs, anywhere from 1 to 10 chemical additives will be added anywhere from a .2 gpm to 2 gmp concentration. And of coarse sand, anywhere from 35k pounds to 600k pounds a stage. 1 well can have 10 to 60 stages.

I fracking don't get why people are always fracking about fracking - just fracking shut up.

It's a fad. Vaccines and frac today, punching babies tomorrow.