Someone who pretty much just eats cheese. Typically a vegetarian, although not a vegan.
Did you see that chick crushing the hors d'oeuvres over there? I heard her say she doesn't eat meat, but she's certainly a cheesetarian. I think she even ate that whole block of limburger.
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.