When you jiz on a girls back, she rubs it in and lets it dry, then arches her back making the jiz "crackle"
"I jizzed all over this girls back and she rubbed it in like a porn star! When she went to get up I heard the dried spooey crackle across her back like a bunch of fire works! What a Crackle Back!
What happens to dried jizz on a girls back when she moves.
I jizzed on this girls back and she rubbed it in. After it dried it made a crackling sound and I said "Damn Crackle Back!"