mansiontwit

To be on cloud nine = estar en el séptimo cielo. When they told me I'd got the job, I couldn't believe it. I was on cloud nine.

It's (just) not on! = ¡Ni por asomo! Look, you can't arrive late every time we arrange to meet. It's just not on.

To be in heaven = estar en la Gloria - This chocolate cake is absolutely delicious. I'm in heaven.

To be ecstatic = estar loco de alegría – “I was ecstatic to see that we have nearly 4,000 followers on Twitter.”