Chuffed to bits: very pleased
Chuffed to bits：对某事心满意足，美滋滋的。
Examples:
例句：
I'm chuffed to bits with my new car!
我对我的新车非常满意！
Anna got three Cs for her exam results. That was better than she was expecting - in fact, she was chuffed to bits!
安娜的考试得了三个C，比她预期更好。事实上，她已经心满意足了！