Bend and pat: to bend your knees and pat your feet on the ground; to walk.
How am I gonna get there?
You better bend and pat!

Don't eat the dead ones!: a warning to not eat boiled crawfish that aren't curled up because any that have straight tails were dead before they were boiled.
Y'all enjoy, but remember, don't eat the dead ones!

Poke and grits: to poke your feet under the table and grit your teeth
Mom, what's for supper tonight?
Poke and grits!

The grandaddy of popular American slang
 

23 skidoo meaning to leave advantageously or to be bum rushed out depending on how it was used

oh and probably (although I use the phrase) bum rush which means to be thrown out from around 1910 apparently the phrase received a revival in the 1980s and came to mean to be slammed into a fence, wall or other surface by someone taking a run at you

Oh and one more, shrive, it means to forgive sins or obtain forgiveness by confession
the past tense is used still today, shrove, as in shrove Tuesday for lent (aka Mardi Gras)

Close! But no cigar.

and as my mom would say...

and beat you again on Thursday.

loads.
 

I bet I have 427 million of these , thanks to my grandmother. Here's a few:
Live by the sword die by the sword.
Those who have will get.
Beggers can't be choosers.
It will all come home to roost.
If you want to dance you have to pay the fiddler.
If you'll do something once, you'll do it again.
Don't believe anything you hear, and only half of what you see.
Love me, love my dog.
I will post more another time.

Dilatory - tardy, stalling

*I was prepared to leave a 5 o'clock but was delayed by my dilatory child.

more
 

Inspired by Mary Hooper.
Take your half out of the middle.
You're all shined up like a new penny.
That car is deer. (meaning the car is expensive)
Oh she thinks her shit is better than ice cream, I don't see anyone following her around with a dixie cup.
The hail fellow well met. (Meaning he thinks he's more important than he is)
Too dumb to come in out of the rain.
You pay the band, you pick the music.
Hard work never killed anybody yet.
You kids have everything coming and going, you don't know what it means to go without.
Like it or lump it.
Everyone has something to offer.
But for the grace of god, there go I.
Shirts going one way, pants going the other, you look like a bag tied in the middle.
(My fav. One) laughing leads to crying.

Ah shucks!

again
 

And yet I have more. Ha Am I the only one posting on this thread? Haha
If wishes were horses beggers would ride.
people in hell want ice water. Usually came after I said I wanted something she couldn't afford.
Give um an inch they will take a mile.
Watch your p's and q's.
You're gonna poke your eye out! Hahahaha
Show me your friends, and I'll tell you what you are.
Your opinion and 50 cents will buy me a cup of coffee
You don't know shit from shinola. Ha still haven't found any shinola.
Birds of a feather flock together.
You're so full of it your eyes are brown.
You could screw up a 1 car funeral procession.
A fool and his money soon part.
You're still wet behind the ears.
You're a day late and a dollar short.

Let's ditch this popsicle stand.

I don't think I've used this one yet...
 

Chinwag -

–verb
1. to chat idly; gossip.

–noun
2. an idle chat; gossiping.

give your head a wobble - to ask someone to re-think what they have said

my momma use to say...
 

I'm not sure how particularly old-fashioned this is, but my grandma uses it and so do I:

passel - a large group of people or things; a pack.

I usually refer to the dogs in my home as a "passel of demons." Okay, there are only three of them but they sure feel like a larger pack when they all clamber around to say hi when I get home.

Any sentence followed by "Bless her heart" (as in, "She's a little dim, bless her heart")
She doesn't have the sense God gave a billy goat
Mind your P's and Q's (oops, that's been said-oh well)
Don't be a flibberdegibbet
Don't read me the entire magillah (from mother)
All that and a bag of chips
The bee's knees
I wanna knock you into next week! (meaning a punch, or..something ;))
A bird in hand is worth two in the bush
Robbing Peter to pay Paul