謝邊邊mm, 這個cold fish其實經常~~

指那些對人很冷淡，很不友好，根本沒有意思和別人友好相處的人。這些人往往不受人歡迎。
Let's not invite Joe to the party: he's such a cold fish he'll spoil it for everybody else.

其實俗語中還有一個很常用的意思
A sex partner who is either not receptive, or not providing any emotional or physical feedback during ...

I am not trying to be "yellow" here, just explain a phrase...