불알친구
Very close friends that have been known each other since they were very young

빈대 + 붙다
To parasitize, to be dependent on somebody esp. financially

빌어먹을
Damn
E.g. 빌어먹을 개새끼  that damn son of a bitch

빙신
a retard, a stupid inept person
syn. 병신

빙딱
a retard, a stupid inept person
syn. 병신

빛나리
A chrome-dome

빠구리 + 뜨다
to have an intercourse

빠꾸
This Korean word is originated from the English word 'back'.
a) To move or drive backwards
b) + 먹다
To be turned down, to be rejected
E.g. 여기 합격하기까지 네번 빠꾸 먹었어요.  I got turned down 4 times before I got a place here.

빡돌다
To go nuts, to be very very frustrated, to go frenzy

빡세다
To be physically or /and mentally draining, very hard + difficult, tough
E.g.  존나 빡세다.  It's a real toughie.