Idioms which expresses the extreme happiness…
There are many informal idioms which mean extremely happy but here are the most useful ones:

- I’m over the moon.

- I’m in seventh heaven

- I am / feel on top of the world.

- I am thrilled to bits.

- I am on cloud nine.

Some other happiness Idioms:

jump for joy:

Meaning: be very happy and exited about something that has happened
Example:  Sara jumped for joy when she heard that she’d won first prize.

somethings makes your day:

Meaning: somethings  makes you feel very happy
Example: It’s great to hear it from you. it’s really made my day.

be floating / walking on air:

Meaning: be very happy about something good that has happened
Example:  I’ve been walking on air ever since Chris and I started going out together.

get a real kick out of something:

Meaning: Very much enjoy doing something (informal)

Example: I get a real kick out of going for a run first thing in the morning before anyone else is up.

do something for kicks:

Meaning: Do something because it is exciting, usually something dangerous (informal)

Example: Sandra is keen to have a go at bungee jumping – just for kicks.

Related Posts :

• Making an effort (Easy or Difficult)
  Effort Making an effort Idiom: give something your all Meaning: use your all energy and effort ...
• Idioms with the Word “Black”
  Here I offer some slangs which contain the word "Black". 1) as black as a skillet: very black ...
• Six Idioms
  Here are the most common idioms and slang with number "6". In order to have be more comprehensi...
• Fun Idioms
  Here are some idioms with the word "fun" that you can use in different situations...Fig....
• Idioms in Ameican English (#1)
  Another new interesting post by our new member "Zebelkhan". Here are some new useful American ...