以前經常一起八卦聚餐游玩的好友最近突然沒動靜了？快看看她是不是在朋友圈里秀恩愛呢吧。這些一談起戀愛就在朋友中間玩兒消失的人，你們真是“有異性沒人性”吶。

Hiberdating means dating in the winter months, or the situation that someone ignores all their other friends when they are dating a boyfriend/girlfriend. The second meaning is more popular. The word hiberdating is a blending of the word “hibernating” and “dating”, which means a person is in a state of inactivity(hibernation) among friends when dating someone.
Hiberdating指在冬季約會戀愛，或者指某人在談戀愛期間忽略其他朋友的情況，也就是我們常說的“有異性沒人性”。第二種用法更普遍一些。Hiberdating這個詞是hibernating（冬眠）和dating（約會）兩個詞的合成詞，由此便可知它的意思是一個人在約會戀愛期間中斷與朋友聯絡的狀況。

For example:

I haven't seen or heard from Jennifer since she started hiberdating Teddy four months ago.
自從4個月前詹妮弗跟泰德約會以來，我就一直沒有過她的消息。

（中國日報網英語點津 yaning）