Make my haters sit the fuck down, Franky Roosevelt
With that polio flow homie I'm dope as hell
Franklin Roosevelt(FDR) had Polio. This is a paralytic illness which confined him to using a wheelchair much of time. Thus he was sitting down.
Polio is an illness, so Webby is using it to say that he has an ill or sick flow.
To help improve the meaning of these lyrics, visit "Until I Die" by Chris Webby (Ft. Zavaro) Lyrics and leave a comment on the lyrics box