Reputed is the operative word.
They more or less will make you sick, not high. But.......people do stupid things.
Now heroin and natural opiates do get you grinning from ear to ear.
Oxicodone is a sythetic molecule that mimics the pain relieving qualities. It has little or no real high, as I would describe it, however when mixed with alchohol it enhances the effect of the alchohol very highly.
This is what they are doing with it. All it takes is a couple of beers to do the trick.