@M0nica I don’t think you can take it upon yourself to dictate what Kitty or anybody means when they use a word.
You think pejorative, Kitty and I and others think tongue-in-cheek or jokey.
You just have to accept that.
When I use a word,’ Humpty Dumpty said in rather a scornful tone, ‘it means just what I choose it to mean — neither more nor less
The question is,’ said Alice, ‘whether you can make words mean so many different things.’
The question is,’ said Humpty Dumpty, ‘which is to be master — that’s all.”
― Lewis Carroll, Through the Looking Glass
But if you want or need a dictionary definition…-
posh
/pɒʃ/
adjective
elegant or stylishly luxurious.
"a posh hotel"
adverbINFORMAL•BRITISH
in a refined or upper-class way.
"he may talk posh, but there is nothing fancy about Basil"
nounINFORMAL•BRITISH
the quality of being elegant, stylish, or upper class.
"we finally bought a colour TV, which seemed the height of posh"
verbINFORMAL•BRITISH
smarten someone or something up.
“we will be getting all poshed up for the company summer ball"