In the slammer means to be in jail in prison.
Three of my friends from high school have been in the slammer for one crime or another.
Go with the flow means to do the same thing every one else is doing.
When I was in high school I usually went with the flow, even though I knew some of the things we did were wrong or illegal.
Hit the nail on the head means that one is correct about something.
When Donny answered his fathers question his father said” You hit the nail on the head.
Hop, skip, and a jump means someplace is very near.
I lived a hop, skip and a jump from the junior high school I attended when I was young.
Break a leg means good luck, many time used before a performance on stage for a play.
Before I went on stage to give my speech my teacher said “Break a leg”.
Burn the midnight oil means to work or studying very later into the night.
I frequently burnt the midnight oil studying for final exam in college.
Light on one’s feet means a person is agile and moves around quickly and easily.
Mohammed Ali, one of the greatest fighters of all time was very light on his feet.
Like two peas in a pod means two persons or things are very similar.
People also said my brother and I were like two peas in a pod.