RFotD

The word posh, which denotes luxurious rooms or accomodations, originated when ticket agents in England marked the tickets of travelers going by ship to the Orient. Since there was no air conditioning in those days, it was always better to have a cabin on the shady side of the ship as it passed through the Mediterranean and Suez area. Since the sun is in the south, those with money paid extra to get cabin's on the left, or port, traveling to the Asia, and on the right, or starboard, when returning to Europe. Hence their tickets were marked with the initials for Port Outbound Starboard Homebound, or POSH.