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The most insulting insult in the kpop world pretty much...ever. The word originates from Rap Monster (BTS). In korean the word fun sound a lot like the english word jams. That is why Rap Mon told Jimin (BTS) that he has no jams. Meaning that he is "very no fun" (J-Hope said this about Jimin). Saying U GOT NO JAMS means you are telling someone that they are not fun.
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