Typically referring to those who practice in the art of pairing two male Assassin's Creed characters together, and proceeding to screw each other in a timely and hardcore fashion. Most common among this categorical subject would be the aggressive couple of Malik / Altair -viceversa- and/or Ezio /Leonardo. This also can contain the much more sparse pairings (Known as 'Crack Pairings') such as Robert /Altair, or even Ezio/ Feathers .
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.