An Inrection is the opposite on an erection. This means your penis actually inrects itself back into your body for safety reasons.
A) Being hit extremly hard in the genatal area will cause your penis to actually inrect (inrection) inside you body possibly puncturing some vital organs. B) Seeing the most hideous beast of a girl walk into a bar, can actually force your penis back inside your body to keep itself from being exposed. C) jumping into a very very cold body of water IE. "Pool, River, Ocean, Large puddle" can force your penis into shock and send it back inside your body for warmth and shelter.