1.) A phrase used when one desires to orally please another.
2.) An assertive lover or drunken one night stand might use this phrase to be direct and to the point of wanting to eat the lucky womans pussy.
Oh baby..you are so hot, I'm dying for you to "sit on my face".
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.