我一口大姨妈喷死你
[wŏ yī kŏu dà yí mā pēn sĭ nĭ]
Quite an irreverent expression translating as 'I'll curse at you enough to give you PMT (or literally 'spray you to death with period')'. It's typically used humorously by younger netizens to express anger in a lighthearted manner, without intending real hostility.