Fake Subs in kpop means "fake subtitles", meaning what it says they are "saying" isn't what they actually said. If it says fake subtitles, everything the person "says" in the subtitles are fan-made and not real.
Kpop Idol's words in fake subs (fake subtitles) : I'm a mafia leader!!
Kpop Idol's words in actual subs (correctly translated subtitles) : You're really tall!
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