A designation given to someone who is beyond clueless on statements that are more than obvious to everyone else
Someone who is slow to catch on or major dense. When references are made that they should know they respond with 'HUH?'. Typically you need to repeat it 2 or 3 times and then after the 3rd time you have to break down get all upset and explain it in gory details to them.
This was coined as iridium is the densest material known to man.
Can someone please explain winders logic to Captain Iridium? I have told him three times already and will kill myself if I have to again.