懵逼

困懵逼了,差点儿一头扎进男厕所

I was so sleepy and confused that I almost rushed into the men's restroom.

这个视频看完绝对一脸懵逼

You will definitely be dumbfounded after watching this video.

我知道对方身份后,瞬间一脸懵逼

I was instantly dumbfounded after knowing the other party's identity.