1. Bee's knees
  2. Cat's pajamas
  3. I like the cut of your jib
    Stop looking at my jib
  4. The cat has got your tongue
  5. Proof is in the pudding
    I feel like I did know what this meant at one point. But I've forgotten it.
  6. It's raining cats and dogs.
  7. Head over heals
    Most people's heads are usually over their heels