Fresh off a Lollapalooza set Sunday, 2 Chainz headed to Late Night With Jimmy Fallon last night, where he received a little help from the Roots.The rapper performed "Feds Watching" off B.O.A.T.S II: ME TIME,which is set for release on September 10th. A small crowd gathered and danced behind the Roots, Fallon's house band, while the rapper sauntered across the stage. Horns and electric guitar brought the song to life as 2 Chainz promised "I'll be fresh as hell if the Feds watching."