phrase, colloquial
has it come to this?; is that really the case?
甲：如果他忘記送我生日禮物，我可能會跟他吹了。 乙：至於嗎？
甲：如果他忘记送我生日礼物，我可能会跟他吹了。 乙：至于吗？
jiǎ ： rú guǒ tā wàng jì sòng wǒ shēng rì lǐ wù ， wǒ kě néng huì gēn tā chuī le ． Ｙǐ ： zhì yú ma ？ A: If he forgets to get me a birthday present, I might break up with him. B: Isn't that going a bit far?
Examples (Wiktionary)
Mandarin
甲：如果他忘记送我生日礼物，我可能会跟他吹了。乙：至于吗？
甲：如果他忘記送我生日禮物，我可能會跟他吹了。乙：至於嗎？
jiǎ ： rú guǒ tā wàng jì sòng wǒ shēng rì lǐ wù ， wǒ kě néng huì gēn tā chuī le ． Ｙǐ ： zhì yú ma ？
A: If he forgets to get me a birthday present, I might break up with him. B: Isn't that going a bit far?