The word "posh" is an informal adjective used to describe something that is elegant, luxurious, or stylish. It often implies a sense of high social status or wealth. For example, a posh restaurant has a sophisticated atmosphere and serves high-quality food, while a person might be described as posh if they dress in designer clothing and have refined manners.
The origin of "posh" is somewhat unclear, but it is believed to have derived in the early 20th century from the phrase "Port Out, Starboard Home," which referred to the more desirable (and thus more expensive) cabins on ships traveling to India in the British Empire. These cabins were located on the port side of the ship on the way to India and on the starboard side on the return, ensuring better views and less exposure to the sun.