What does the (NSFW) insult that Shao Kahn in Mortal Kombat says when you fight him (NSFW)

It means you suck and need to get good.

It’s Chinese for “All your face are belong to us!”

“You suck” is a vulgar American expression. It means you are really poor (in this context, at fighting).

(NSFW) I was wondering if I meant you are still breast-fed by your mother? Or you are sucking eggs? Or you give bjs?

No.