Reunited since 2010, Man or Astro-man? is a Southern surf-rock band that performed through the ’90s, often garbed as spacemen and nerds. The group was always funny, in a Devo sense, but its posthardcore take on Ventures-style twang meant business. Here, the chaps plug Defcon 5…4.…3…2…1, their 2013 comeback effort.