你爷爷个鸭小腿你奶奶个鸡大腿
[nĭ yé yé gè yā xiăo tuĭ nĭ năi năi gè jī dà tuĭ]
Translated directly it's an absurd string of nonsensical family member associations and body parts which is typically used for humor or when expressing extreme annoyance and displeasure in Chinese context.