The shoulder blaster comes from Stew Smith, and involves a complex of arm only, or lightly loaded shoulder exercises, 1 reps each. Here’s the sequence:

1x Shoulder Blaster = ….
10x Forward Arm Raise, thumbs up
10x Forward Arm Raise, thumbs down
10x Forward Arm Raise, thumbs up on the way up, thumb down on the way down
10x Lateral Arm Raise, thumbs up
10x Lateral Arm Raise, thumbs down
10x Lateral Arm Raise, thumbs up on the way up, thumb down on the way down
10x Lateral Arm Raise to cross overhead, thumbs up
10x Shoulder Press