DJ Luna C used this term in his book "The Rave Commandments". What he means, is that a scene starts eating itself, when it becomes oversaturated by artists all sampling each other and recycling the same ideas and legendary samples like the piano riff from Liquid's (RIP) Sweet Harmony. Innovation stops, ideas become homogenized and music starts to sound the same. A Finnish DnB artist Fanu said on Facebook, that you don't sample from the same gene pool.
So where do you stand in this regard? I for one can't help but feel disdain when people use sample packs and premade samples, instead of sampling stuff themselves. Even more so, if they just directly sample some other track from the exact same genre.
I feel a level of pride in playing my school piano, and recording it, and sampling it. But then again, I also love using many of the vocal samples that have been used all over the place for the last 30+ years, apart from maybe the ones that are immediately recognized, except from the original source.