After a friend, family member, or just about anybody you know does something remarkable you congratulate them by sneaking up on them and ejaculating on their body... preferably their achilles or calf.
My sistergot an 1100 on the SAT so I gave her a big cumgratulations.
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.