ㅂㅅ /byeong-sin/
Idiot / Dumbass (vulgar)
Short for 병신 (byeongsin). A strong insult — historically referred to disabled people but now used as a general insult. Only used among very close friends jokingly or as a genuine insult. Use with caution.
Examples
ㅋㅋ 진짜 ㅂㅅ같다
Lol you're such an idiot (joking between friends)