Floss Blockin' is when someone with a ragged out, peace of trash car parks around another vehicle that is Flossin.
Kool Dude: "YO IM SO FUCKIN PISSED!!"
Kool Dudes Friend: "Y is that bro?"
Kool Dude: "You know how I always park way in the back at Wal-Mart to let everyone see my pimp ass Gator on 24's. Well some ass in a Hoo-Doo comes park right on the side of me and block my whip yo!!."
Kool Dudes Freind: "Dont trip hes just Floss Blockin' !!"