Don't just twiddle your thumbs, help us clean up this mess. What does "twiddle your thumbs" mean?

Mom had a cow when she discovered the mess her kids had made. What does "had a cow" mean?

The mayor gave the city the green light to build the mall. What does "green light" mean?

After working for 12 hours straight, I looked like something the cat dragged in. What does "like something the cat dragged in" mean?

My friend finished telling me a crazy story and then she said she was pulling my leg. What does "pulling my leg" mean?

The teenager was in the doghouse, because he came home late past his curfew and didn't call his parents. What does "in the doghouse" mean?

I was upset with Tom, so I gave him the cold shoulder. What does "cold shoulder" mean?

Mike and Ed are joined at the hip and go everywhere together. What does "joined at the hip" mean?

The boring story went in one ear and out the other. What does "went in one ear and out the other" mean?

Mom says dad's eating habits should change, but you can't teach an old dog new tricks. What does "can't teach an old dog new tricks" mean?

When Mom called the dentist, she made a dentist appointment for herself and paid her son's bill and she said she killed two birds with one stone. What does "killed two birds with one stone" mean?

We are as busy as bees getting ready for the party. What does "busy as bees" mean?

If you wolf down your food, you might get sick. What does "wolf down your food" mean?