Jets receiver Jerome Kapp transformed into Eminem for New York's rookie talent show this month ... and the guy crushed the role so hard -- even Aaron Rodgers had to give him a standing ovation.
The performance all went down last week inside a Jets team meeting ... when after the veterans made some of the squad's newcomers grab a mic for them, Kapp decided to re-enact Em's famous freestyle from "8 Mile."
And, thanks to "Hard Knocks" cameras -- we got to see the epic concert in its entirety.
Kapp threw on a beanie and a hood, put the movie's famous track on the speakers .