He's all tied up.
He's very busy.
The icing on the cake
Extra, which makes something good even better!
Hold your horses!
Wait! Stop!
Put on your thinking cap.
Try to solve a problem.
They're in hot water.
They're in trouble.
It's raining cats and dogs.
It's raining very hard.
She's down in the dumps.
She's very sad.
He's catching some z's.
He's sleeping.
on the same page
we agree
I'm all ears.
I'm listening carefully.
He's a couch potato.
He watches too much TV.
They're going bananas!
They're behaving in a crazy way!
He has butterflies in his stomach.
He's nervous.
I'm on cloud nine!
I'm really happy!