난도질
a brutal murder using a knife

날라리
A teenager who has more interest in being cool (underage smoking, drinking, clubbing..  stuff like that) than in study.

내숭떨다
To be coy

널널하다
free, spacious, roomy
E.g.  오늘 시간 널널한데 만나자.  I'm free today, let's meet up.

년
(suff.) a derogatory term for woman
E.g. 개년

노가다
A phisically demanding job.  usu. a construction job

놈
(suff.) a derogatory term for man
E.g. 쌍놈

농땡이
To slack off at a job

놓다
반말하다.
syn. 까다
E.g. 갑이네. 말 놔도 되지?

눈깔
A derog term for an eye
Ex.  A. 화장 안하니까 더 이쁘네.  B. 눈깔 뼜냐?  A. You look better without make ups on.  B. Your eyes fucked or something?

눈깔뼜냐?
What's wrong with your eyes?  You really need a pair of glasses.