Rae Sremmurd wants to sing the national anthem at the World Series so badly, they're auditioning RIGHT OUTSIDE IN L.A. ... while smoking a bunch of weed.
... and it's actually pretty good (aside from skipping a bunch of the words).
Slim Jxmmi and Swae Lee tell TMZ Sports ... they REALLY want the Dodgers to come back and take down the Red Sox and if they can sing "The Star-Spangled Banner" before one of the home games, it would energize the hell out of the Blue Crew.