1. What does it mean?
A playful reshaping of 열받네 (“that makes me mad”) using 킹, from the English “king,” for emphasis. It can describe something genuinely annoying or something so cheeky or absurd that the speaker is half amused.
Also written or said as 킹받다
2. The nuance
The strength of the irritation depends on the situation. It is not always a harmless joke, and a playful translation will miss the mark when the speaker is truly upset.
3. Examples
“내가 남겨 둔 마지막 과자 먹었어? 킹받네.”
You ate the last cookie I saved? That's irritating.
“그 표정 자꾸 지으니까 킹받네. 웃기긴 한데.”
That face you keep making is getting on my nerves. It is funny, though.
Sources
Korea Citation Index: word formation of 킹받다 and 갓생
References support the meaning and usage. Example sentences are written for NoCapWiki.