"ni de tou" means your head, "ni ge tou" is a colloquial expression which has a negative or opposite meaning. For instance, "hao ni ge tou" actually suggests "bu hao". What's more, the term "ni ge tou" is often used by people who are familiar with each other, friends, couples, parents and children, etc.

'ni de tou“is right,means"your head". in china we never say"ni ge tou" ni de=your "ni de"+ a noun means "your sth" eg:ni de shubao.(你的书包）=your bag "ni ge “ + a noun we usually use it when we call someone names eg：ni ge shazi=you are a fool

ni de tou 你 的 头 means your head ni ge tou 你 个 头 It's a Slang in some places . means no. "qu ni ge tou 去你个头"means don't go there . If "ni ge zhu 你个猪" means you are a pig.

你个头 应该是俚语了 否定的意思 比如：好你个头 好是肯定 你个头又否定了

"ni de tou"means your head,你的头 "ni ge tou" 你个头is just a pet phrase.maybe it's used for not agreeing with your idea. ^ ^