Here's a few more I've remembered from various people in my life:

"he made out like a fat rat in a cheese factory" - did pretty well for himself

"off like a new bride's bra" - you are out of there quickly.

"my sister talked sooooo slow that before she could say she wasn't that kind of a girl ..... she was" - well it's just a saying we laugh about a lot.

"bless his pointy little head" - it's kind of a sarcastic thank you.

and from one of my english friends:

"love a flamin' duck" -- it's an expression of surprise.