Insults

We need to find out if any of these are useless, say how intense each one is, etc. There may be some I didn't get from the slang page.

Names

다굴 = 왕따 - (n) black sheep, outcast, loner
단세포 - a simple-minded person (Literally, a unicellular animal)
단순빵 - a simple-minded person
돌대가리 - A retard, a moron
동네북 - A weak individual who is regularly abused physically by others, a doormat
놈 - (n) a derogatory term for man, from 쌍놈, but not incredibly offensive
뒷북 - an unaware, thickheaded or dull person
멍텅구리 - A retard
멍청이 - A moron
사오정 - Someone who is unaware, thickheaded or dull
새끼 - a) A derog term for a man. b) This term is also used in a very close circle of friends, just like the American term 'bro', but would still be offensive to any third party.
새대가리 - A birdbrain
순진빵 - a naive person
얌체 - A meanie
조센징 - A derogatory Japanese term for Korean
찐따 - a moron
양아치 - A self conceited prick
폭탄 - Someone who showed up at a 번개 who turned out to be very ugly (완전 폭탄만났어)
형광등 - someone who is unaware, thickheaded or dull
호로 - A contemptible man. often followed by 새끼

뒈져 - Go to heck
싸가지없다 - (adj) someone who is very wenchy and ill-mannered.
재수없다 = 싸가지없다 - (adj) wenchy
어리버리하다 - (adj) someone who can not take care of oneself and is easily taken advantage of.