Bad egg
Bad or undesirable person.
He was a bad egg and always got in trouble for doing naughty things.
Fat is in the fire
Big problem or trouble ahead.
When she discovered his lies, there was fat in the fire.
As warm as toast
Very cozy and comfortable.
Dad tucked the baby in for the night in his new blanket and made sure he was as warm as toast.
Full of beans
Feel energetic. She is full of beans from the moment she gets up to the time she goes to sleep.
Egg on
To encourage or dare someone to do something.
He would never have gone into the dark cave if his friends didn't egg him on.
Chew the fat
Chat casually or gossip.
They were best friends and always chewed the fat after school.
Bread and butter
Something that provides you with an income.
The tips at the restaurant were her bread and butter
Not know beans about
Unfamiliar or ignorant.
I admit that I do not know beans about doing taxes.
Have egg on your face
Be embarrassed.
When no one laughed at the lame joke, she had egg on her face and quickly left the room.
Bring home the bacon
To earn money.
He worked hard every day so he could bring home the bacon and live a good life.
Butter up
Flatter someone to get something.
He buttered up his parents so they would let him go to the party.
Not worth a hill of beans
Not valuable.
His idea was not worth a hill of beans and was quickly rejected.
Walk on eggshells
Be cautious about words and actions.
The boss was in a mood and we were walking on eggshells all day.
Drop like a hot potato
To immediately stop or abandon something.
She dropped her nerdy friend like a hot potato when the popular kids asked her to hang out.
Greatest thing since sliced bread
Something that is excellent.
She thought her new car was the greatest thing since sliced bread
Spill the beans
Tell a secret.
She kept asking me to spill the beans but I didn't want anyone to know that I had decided yet.