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idk= i don't know (몰라)
imo = in my opinion (내 생각에)
hbu = how about you (너는 어때?)
lol = laugh out loud (웃길 때= ㅋㅋㅋㅋㅋㅋㅋㅋ)
nvm= nevermind (괜찮아, 신경쓰지마)
rn = right now (바로 지금)
tbh= to be honest (솔직히)
btw = by the way (그런데말야)
lmk = let me know (알려줘)
ttyl = talk to you later (나중에 얘기하자)