“On the Floor” is a sad, sad disaster of a song, if you can even call it that. With its Europop leanings and lazy Pitbull guest spot, the song reeks of desperation of the kind that bald old men in Ed Hardy t-shirts exude at da club. So, maybe it will be a hit at Karma? Except not even a Jersey Shore crowd drunk out of their minds would get down to this. And for someone who seems to think she’s poised for a comeback, J.Lo isn’t even trying to be current, or even five years ago. The already tired la la la chorus is based on “Lambada.” Kaoma’s “Lambada,” y’all! At one point she even says “raise the roof,” like maybe she is yearning for a time when she was actually relevant.