Lil Boosie -- Nick Saban Is the Enemy ... LSU Needs to Kick His Ass

Now that he's finally free, Lil Boosie is working on the important things in his life -- starting with fixing the LSU football program.

The Baton Rouge rapper was talking to the LSU student TV network a couple of days ago ... when he declared war on Alabama head coach Nick Saban.

"Nick Saban gettin' all our recruits," Boosie said ... "We need to bring back them #1 players and get it back together man."

For the record, LSU isn't that bad ... and finished the 2013 season ranked #15 after going 10-3. But apparently, that's not good enough for Boosie.

In fact, the rapper even makes a recruiting plea to undecided high school football stars -- "put on that yellow jersey!"