To know the difference, you just have to know the context – the situation, the circumstances of the conversation you're hearing or reading about to know which of those meanings " to be all over (someone)" is.

要了解差异， 您只需要了解上下文 - 情况，您正在听到或阅读的对话的情况， 就可以知道“to be all over (someone)” 是哪些含义。

One meaning of " to be all over (someone)" – a person – would mean to be with your boyfriend or girlfriend, your husband or your wife, and to be touching them and kissing them in a romantic way, especially if you're in public.

“to be all over (someone)” ——一个人——的一个意思是指和你的男朋友或女朋友、你的丈夫或妻子在一起，以浪漫的方式抚摸和亲吻他们， 尤其是当你公开的; 当众。