Basically a butt kisser. If you've ever heard of brownie points you'll understand it better. It basically refers to someone who only looks out for themselves and wants to get a bunch of brownie points.
"That man is such a brownie hound" -John Bender from the Breakfast Club
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.