Stemming from the meme "No airbags we die like men", this term has been adopted by fanfiction authors, mainly on fandom website ao3, who use it to signal that their story hasn't been beta-read before posting and might therefore include a few overlooked spelling errors.
Variations of the term have been created for specific fandoms to match a fandom's inside jokes.
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.