When, after releasing a cloud of farticles, you suddenly get up from your chair and walk across the room or office, trailing a cloud of farticulate matter behind you and contaminating the vicinity.
Dude! I heard that! Take your farticle accelerator somewhere else! (waves hands to dissipate farticlecloud)
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.