An acronym for "I concur with your comment/conclusion". It is used after something that somebody says (normally over the internet) that you completely agree with.
Man 1: Dude, that guy is such a dickwad.
Man 2: Icwyc.
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.