Nugget is a term for old mp3 player, can be used to refer to basically anything that ISN'T an apple product. Or those too, those are just "genuine nuggets".
I think Sansa ultimately made the best ones available, culminating in the ubiquitous Sansa Clip Plus, "just a damn thing to plug my sd card into that runs rockbox", but my heart is still with Cowon and all the crazy shit they did.