Being without a knife on one's person when a knife is needed. A portmanteau of Knife and Naked.
I had gotten out of the shower and was dressing a wound, and needed to cut some tape. I found myself not only naked, but knaked without a knife; so I used a magnet to attach a knife to the underside of the table so I would not be knifelessly knaked in that location again.
Pajama casual is a term used when working from home and preparing for a video conference. All business above the waist and your pajama pants down below.