* This can be very rude so don’t say this to anyone^^ Post also contains other swear words so don’t repeat these!  

개념이 없다 = (slang) No common-sense, brainless, rude (lit. to have no concept of something)

개념을 밥 말아 먹다 = lit. To put one’s concept(common-sense, brains) with rice and eat it (have completely no sense, completely brainless)

x 백지영 개념을 밥말아 먹었군 = Park Jiyoung has completely lost all concept. 
미친, 개념을 밥 말아 먹었냐? = Crazy… Have you completely lost all sense?? 
저놈은 개념이 없는 것 아니라 아주 개념을 밥 말아먹었구나 = That asshole doesn’t just have no concept he’s completely thrown it all away. 
x

제가 맛이 가서 그렇습니다. 제가 사랑에 눈이 멀어 개념을 밥 말아 먹었습니다 = I acted like that because I had totally lost it. I was blind in love and completely lost all concept.   

말아 먹다 = To take a bit and eat.. ; (slang) To throw away, ruin, mess up… 

밥을 국에 말아 먹다 = To put rice in soup and eat it. 

내 인생을 말아먹었으니까 = Because I totally screwed up my life..

내가 이걸 다 말아먹었어 = I ruined everything.