Posh (adjective)

1. Elegant, stylish, and expensive.
2. Designating or of a high-class or upper-class social group or lifestyle.

Origin:

The word posh comes from the acronym "port out, starboard home" referring to the best cabins on ships which were on the port side going out and the starboard side coming home. the word has been in use since the early 20th century.

Examples:

1. The hotel was posh and luxurious.
2. The party was attended by posh people from high society.
3. She always wore posh clothes.
4. The restaurant had a posh atmosphere.
5. He was determined to live a posh lifestyle.