To steal someone else's unique style that sets them apart from the crowd, makes them famous, or otherwise steals their thunder making them warrant a lot less attention or swagger factor.
A good part popularized by celebs and hip hop songs like Black Eyed Peas -
Boom Boom Pow. The female artists in the song sings, "Them Chickens
jackin' my style. They try to copy my swagger. I'm on that
next shit now."
A guy goes to a
uppity club or a local trendy,
upscale hang out spot with a few friends but dresses up in fancy black clothing to top the competition which earns him attention of beautiful women. He starts to notice more and more men doing the same looking and acting more like him. He realizes they are nothing but lame swagger
jackers who have no real game of their own but to live off someone else's own success.