Helicopter girlfriend is a hovering, slightly neurotic, but well-meaning, girlfriend who gets way too involved in her partner's day to day activities to the point of interfering with their activities and choices.

直升机女友指整天围着男友转，稍微有点神经质，但并没有恶意的女朋友，她会过度参与伴侣的日常生活，以至于有点干涉到他们的活动和选择。

看个例子：

She is a total helicopter girlfriend who always makes everyone else stop talking to announce her boyfriend is about to say something.

她绝对是个直升机女友，每次都让大家安静下来然后宣布她男朋友有话要说。