Definition of "posh"

Associated with the upper classes.  examples

Stylish, elegant, exclusive (expensive).  examples

(usually offensive, especially in Ireland, Scotland, Northern England) Snobbish, materialistic, prejudiced, under the illusion that one is better than everyone else.  examples

An exclamation expressing derision.  examples

fragments produced by an impact  examples

slush  examples

(normally in the phrasal verb posh up) To make posh, or posher.  examples