得不得了 (de bùdéliǎo) can be used as a complement to suggest a situation is serious, or is likely to result in perhaps terrible consequences. It can be used in a positive sense, like in English when we say "I'm terribly happy".

Stucture

Adjective + 得不得了

Examples

Shēnɡzhí de shìqínɡ rànɡ tā ɡāoxìnɡ dé bù dé liǎo.
1. 升职 的 事情 让 他 高兴 得 不得了。
The things that came up made him extremely happy.

Hēi, tā ɡēn lǎozǒnɡ de ɡuānxi hǎo dé bù dé liǎo. Nǐ yídìnɡ yào xiǎoxīn ！
2. 嗨，他 跟 老总 的 关系 好 得 不得了，你 一定 要 小心！
His relationship with the chief officer is really good, you need to be careful!

Bàbɑ qì dé bù dé liǎo. Nǐ yào dǎoméi lā.
3. 爸爸 气 得 不得了，你 要 倒霉 啦。
Dad is super angry. You're going to be unlucky.

Tā de māmɑ ɡānɡ qùshì . Tā nánɡuò dé bù dé liǎo.
4. 她的妈妈刚去世， 她难过 得 不得了。
Her mom just passed away, she is extremely sad.