Train horning is when a circumsized dude and a cut dude touch tips together, then the "uncut" guy pulls his foreskin over the cut dude while making a train horn sound.
" dude I walked into the gym locker room only to find a couples fags train horning"
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.