the bee's knees-admittedly I've only heard that on tv in my life!
some that I use that others don't seem to use: I almost crapped a cat, it's colder than a well diggers ass, well butter my butt and call me a biscuit, it's colder than a witches tit in a brass bra
my aunt has some special phrases all her own like for thunder and lightening it's "thunder bumpin", she said my uncle drives slower than a turtle's ass-my personal favorite!