I learned about this from my language partner cause he said the writers of this show were on drugs, so of course I had to ask “what’s that in korean?” lol
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to take drugs -> 약을 빨다
빨다 to suck
to take medicine -> 약을 먹다
먹다 to eat
suck medicine = illegal drugs / drugs that intoxicate
eat medicine = medicine for when you are sick
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So when you are watching a show, and it seems like the people who wrote it are high / on drugs, you can say:
그 사람들은 약을 빤 것 같아 ㅋㅋㅋ
I think they took drugs lol (/I think they are high)
무슨 약을 빤 거야?
what kind of drugs are they on??
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But when your friend is sick and you are curious about what the doctor gave them , you can say
무슨 약을 먹어요?
what kind of medicine are you taking?
빨리 나으려면 반드시 약을 먹어야 돼요~
you gotta be sure to take your medicine if you want to get better quickly
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Additional:
It is also an internet slang I am not very familiar with and so will not discuss😅
It is also a vulgar way of referring to taking a prescribed medication
I didn’t feel like looking up all the unknown words so I only skimmed but you can read more here