Here's a breakdown:
* Je ne sais pas: This means "I don't know".
* Foufoufou: This is a playful, nonsensical word used to emphasize the speaker's lack of knowledge.
Overall, the phrase conveys a sense of playful ignorance, like saying, "I have no idea, silly!" or "I'm clueless, haha!"
It's important to note that this phrase is informal and often used jokingly.