꼬이다
To go wrong, to go pearshaped

꼬봉
A patsy, a stooge

꼴통
A retard, an unintelligent person

꼴았다
Of poor quality
E.g.  내 컴퓨터 존나 꼴았어.  십분마다 한번씩 얼어.  My computer really sucks.  It freezes up every ten minutes.

꼴초
= 골초, a heavy smoker

꼽사리/ 꼽싸리
= 깍두기, someone who is not officially admitted, but still attending.  someone who's not at all important.  an extra.  someone whose presence wouldn't make any difference.

꽝
a. BANG!
b. a failure, off

꿀꿀하다
to feel cranky, to be in a bad mood, grouchy