You can say I am chuffed.
You are chuffed or you're feeling chuffed.
Someone looks chuffed.
A: Why are you looking so chuffed with yourself? 为什么你会那么高兴和满意?
B: Well, my boyfriend just asked me to marry him. 嗯,我男朋友刚才向我求婚了。
A: Congratulations. 恭喜。
A: How did your job interview go last week? 上周你的面试进行得如何?
B: Great, I got the job. I’ll start next month. 很好,我得到一份工作。下个月开始上班。
A: Wow, you must be feeling so chuffed. 哇,你一定很高兴吧。