尼玛不是你妈是你妈
[ní mă bù shì nĭ mā shì nĭ mā]
'F**k No, It Is Actually Your Mother (literally, 'Ni Ma' means your mom)': In English, this could translate more accurately into a very offensive term referring to one's mother in an impolite manner; used here probably to emphasize extreme dissatisfaction or surprise using a vulgar tone.