fangirl/fanboy 脑残粉

Fangirl refers to a female fan, obsessed with something or someone to a frightening or sickening degree. They may have obsession over anime and video game characters, or over real people like the Orlando Bloom.

女的“脑残粉”指的是痴迷于某事物或某人到了可怕或变态的程度的女粉丝。她们或是痴迷于动画片或电子游戏中的虚幻人物，或是疯狂迷恋真人，如电影明星奥兰多·布鲁姆。

Similar to fangirl, fanboy is an extreme fan or follower of a particular medium or concept, whether it be sports, television, film directors, video games, etc. 

和女“脑残粉”类似，男“脑残粉”是疯狂痴迷于或追随某种媒介或概念的粉丝，他所痴迷的可能是运动、电视、电影导演，也可能是电子游戏。

For example:

I've spent too much money on iPhones, I’m such a iPhone fanboy!

我在苹果手机上花了太多钱了，我真是苹果手机的脑残粉啊！