The Party Boyz Feat. T-Pain, Waka Flocka, ‘Flex’ — New SongThe Party Boyz Feat. T-Pain, Waka Flocka, ‘Flex’ — New SongArtist: The Party Boyz feat. T-Pain, Waka Flocka Flame Song: 'Flex' Why You Should Listen: T-Pain and Waka Flocka join the Party Boyz on the "T-Mixx" of the Dallas-bred crew's party single. BoomBox StaffBoomBox Staff