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An insult.

Claiming that someone "got no jams" is basically saying that said person is no fun or anything else along those lines.

It's actual origin is unknown, however it quickly became popular when the rapper and leader of the Korean hip-hop boygroup Bangtan Boys (BTS), Rap Monster (RapMon/Kim Namjoo), turned to one of his members (Jimin) during a flight to L.A and said that he "got no jams"
(Jimin being dumb and a camera whore)

J-Hope: Oh, Jimin is very no fun...

Rap Monster: Jimin, U got no jams.
by AdventureTiem101 July 23, 2014

Words related to U got no jams

bangtan boys bts dumb j-hope jimin rapmon