There are 2 primary meanings for PG in rap. You might already be familiar with one but we doubt you know the entirety of its meaning.
PG stands for “Parental Guidance” and is often used as warnings for shows that are too violent or offensive. When you say PG, you may mean that someone or something is dangerous and not for kids.
“You better close your eyes and mouth while I rap because my stuff is PG.”
PG may also refer to “Proving Grounds.” In the URL or Ultimate Rap League, this is the preliminary stage where newbies get roasted and tested.
“I never survived the PG. I guess my game is too weak.”