Raf is a name but it really means;
R= Retarded A= Ass
F= Fuck
Raf can describe a person other than being a name. although there is a Raf out there. if not, then a nickname
The common term RAP, meaning rhythm and poetry does not encompass artists like Cardi B, Migos etc.
These artists are RAF artists, because their lyrics aren't poetic in anyway but just focus on showing off their wealth and status, A.K.A. Flexing
