감탄고토가 · 감탄고토를
taking what suits you and rejecting what doesn't, self-serving fickleness
Example
필요할 때만 찾아오는 그 친구는 감탄고토의 전형이에요.
That friend who only comes around when he needs something is a classic opportunist.
Word parts
감 sweet+탄 swallow+고 bitter+토 spit
Literally 'swallow the sweet, spit out the bitter'.
Related words