NFL rookie Jordan Davis impressed the hell out of his Eagles teammates at training camp -- but it didn't happen on a football field -- the first-round draft pick sang his ass off to a Rick James classic ... during a performance in front of the whole team!
The impressive performance was caught on video Thursday ... when the 13th overall pick out of Georgia hit the stage at Eagles' camp at Lincoln Financial Field for his rookie performance ... when the vets force you to perform on stage.
Most guys aren't any good .