A person who enjoys inflicting maximum damage on other players with little to no effort whatsoever. Aim is not a necessity to this person, although trajectory skills are useful. Constant explosions and creepy laughter is a regular thing for a Junkrat Main.
"Oh, the enemy team has three tanks? Don't worry, I'm a Junkrat Main."
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.