I'm Dope in white hoods not Ku Klux Klan
This is a fairly clever wordplay.
The first thing that this line projects is that he is calling himself dope, and talks about wearing a white hood, much like a Klu Klux Klan member would.
However, he goes on to state that he’s not Ku Klux Klan, and this helps the listener realize that Gambino is talking about white ‘hoods’, as in ghettos.
Gambino is saying that he’s cool with the average urban white listener.
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