Unbeknownst to the majority of seafaring Sargeants, this is the colloquial spelling of the more commonly known phrase “kiff”.
The use of this adjective spelt as “keeyaf” is reserved for the occasion in which the purveyor of the word is determined to illustrate the uttermost “kiff-ness” of a situation.
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.