잠수 타다 (jamsu tada) : to go off the grid, to go ghost
잠수 타다 literally means ‘to submerge’ like a submarine cutting contact to become invisible. It refers to the behavior not to contact people and let anyone know where he/she is.
허당 (heodang) : sloppy and clumsy person
허당 indicates people who are inexpertly clumsy. However, this phrase doesn’t refer to people who just often make mistakes. Rather, it is used to describe people who look smart and perfect but are actually sloppy.
멘붕 (menboong) : mental breakdown
멘탈 + 붕괴
멘붕 is comprised of 멘탈 (mental) with 붕괴 (collapse). This phrase literally means that the mental status is collapsed and on the fritz. It is usually used when something shocking or bad happened, you get so confused and don’t know what to do.
착한 OO (chakan) : something good/cheap/reasonable
Originally, 착하다 (good) is used to describe someone’s personality. Recently, this word has been used to indicate something good, cheap and reasonable which make you satisfied.