Yeah, we had to look that word up too ... turns out, progenitor means creator or originator.
So, is that true? Is Gucci the godfather of trap?
We also asked Grazer how he felt about Halsey getting an "8 Mile"-style biopic.
Grazer has previously compared Gucci to Eminem ... saying they're both as authentic as it gets.
Gucci's story is pretty amazing -- he grew up poor in Alabama, spent 3 years behind bars ... and still emerged as one of the most influential rappers of his era.