NBA season is upon us! And the Dallas Mavericks are celebrating with a video that answers that age old question: What Do The Mavs Say? Turns out, great moves are not limited to the basketball court. Yes, it's the Mavs parody of the Ylvis smash viral hit What Does a Fox Say? And guess who gets the part of the seven-foot fox? Dirk-dirk-dirk-dirk-dirkerdirkedirk, of course -- as in Nowitzki. Hatee-hatee-hatee-ho!