1. He has pubic hair on his head as a wig. 2. He sports a pubic wig (in his pubic area). 3. He makes pubic wigs from the hair on his head.
I doubt it's number 2 because Questlove is famous for his hair, so it seems natural that this joke is about his hair.
Maybe it's a completely random joke about pubic toupees but it would seem strange to me that his afro didn't cross anyone's mind while coming up with this joke.
********** "Everyone has a plan until you punch them in the face. Then they don't have a plan anymore." (c) Mike Tyson
"One of the most important things in life is what Judge Learned Hand described as 'that ever-gnawing inner doubt as to whether you're r