A Leopard Can't Change His Spots

 You can't change.

Brownie Points

 Bronies that point out.

Chip on his Shoulder

 Help him out.

Dirt Poor

 To be poor.

Eat Drink and Be Merry

 Drink beer and eat all night.

Funny Farm

 A funny farm.

Go The Extra Mile

 Run extra mile.

Hit the Hay

 Start working on moving the hay.

I'll Have His Head On A Platter

 It means to get somebody back.

Joshing Me

 Telling someone to be quiet.

Knock on wood

 To hit on wood with your hands.

Like a chicken with its head cut off

 It means to be crazy.

My Brother's Keeper

 To keep my somebodies secret  safe.

No Room to Swing a Cat

 No money to have a cat.

Over the Top

 Over the roof.

Put on your thinking cap

To use your head.

Quality Time

 To be quiet.

Rain Cats and Dogs

 Dog and cats that are in the rain.

Skin of your teeth

Til the cows come home

 To bring the cows home.

Under the Weather

 Weather is bad.

Van Gogh's ear for music

Who Let The Cat Out Of The Bag 

X marks the spot

You are what you eat

It means what ever you eat is the weight you gain.

Zero Tolerance