fat chance
slim chance

You don't have a job, fat chance of that happening.

OK, fat chance of that, but it isn't the state's job to perpetuate ignorance.

"A fat chance that they'd do anything," he said.

How come a slim chance is the same as a fat chance?

But ever know a Loonie to refuse to bet when he stood a big fat chance of one in seven?

The cops had rolled back to let him in, but there was a fat chance they'd repeat the favor.

Tell him what a fat chance he has of getting away with it, Tim.

But I think there?s a fat chance of that happening.

"And fat chance we'll get him to tell us anything."

"No matter what a girl's character was she stood a fat chance of not knowing him!"