Emo Jimmy Butler is back in a big way -- the Miami Heat star is heavily featured in Fall Out Boy's latest music video ... playing the role of a dancing cowboy!!
Butler -- who looked more like Jimmy Heat World during Miami's media day thanks to his hilarious haircut -- brought the look back in the visuals for "So Much (For) Stardust," which show him grooving while rocking an all-purple, bedazzled look.
The first half of the video is all about Butler ... before his character shakes a magic 8 ball and the band's bassist, Pete Wentz, pops out in a beige costume that rivals the hooper's ensemble.