The little dried pieces of shit that are stuck on the inside of a toilet bowl; usually the result of an explode-a-poo.
When I peed in Stewart's toilet, I tried to knock off some of the poo niblets, but they wouldn't come off. He's going to have to use a power washer or something.
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.
We have a Zoom meeting in a few minutes and I’ll probably go pajama casual.