An 'out of the ordinary' individual who just by being themselves, will constantly commit faux pas perceived as lude or inappropriate.
Things a crassmonkey might do:
*Eat Swedish Fish found on a park bench
*Pick his nose in public
*Eat the butt end roach of a joint to refrain from wasting pot
*Burp often
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.