Fettipopper is a social item in the Captain Outfitter. It enables Confetti Pose.
It looks like a small pad with a tube on it. The shape of tube tepends on the level of the Fettipopper
When used, confetti will burst out of the Fettipopper tube.
Fettipopper upgrades Pose even if you don't have arms or legs. It can be upgraded, but will use energy, and use more energy per use as you upgrade it.
If you really need good social parts on your captains, parts like these are a must for those people. But if you don't need too much social ability, the Imperial Robe would probably be a better option.