An insult. Doesnt really mean much, though one can assume the person you accuse of being a fiddlefucker infact has sex with fiddles. The Troma movie Tromeo and Juliet made this word popular upon its release.
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.