We can use many idiomatic expressions to talk about our happiness. Idiom makes your conversation sound very interesting and less monotonous. There are some famous idioms which we use to talk about being happy. Examples- over the moon, full of the joys of spring, happy-go-lucky, happy bunny, tickled pink, ginning from ear to ear, bursting with joy, on the top of the world, on cloud nine, walking on air, have a whale of time, have a ball, with bells on, grin like a Cheshire cat, paint the town red