What is the meaning of Posh?

Associated with the upper classes.

Stylish; elegant; exclusive; luxurious; expensive.

Snobbish, materialistic, prejudiced, under the illusion that one is better than everyone else.

An exclamation expressing derision.

fragments produced by an impact

slush

A halfpenny or other coin of little value.

Money.

To make posh, or posher.

cat

dust

Source: wiktionary.org