Lol wtf guys. Yeah shes either saying nuki nuki which mean to pull out or niyoki niyoki which is an onomonopia (I think I spelled it wrong) thats supposed to mean like something growing like a tree. IT sounds perverted.
Lol but I didnt watch the video so I have no idea what you guys are talking about. I`m just half japanese so I`m just guessing from the words.