After an intense work out a heavy set person pokes into there belly button for lent only to find that a odor has built up that smells like 65 year old dingle berries from a wild sheep dog and microwaved garbage and intentionally puts said finger to a friends nose and ask him to smells, unaware to the friend of the odor he sniffs and in disguised by the raunchiness of his friends finger which in turns makes his nasal passages wither and die.

A popular definition seems to be that P.O.S.H was printed on tickets for P&O cruise ships in the early 20th century leaving India. These tickets were for the more desirable rooms which put you on the Port side going out and the Starboard side returning home as it kept you out of the sun and kept the room cool.

However, no tickets have ever been found which had P.O.S.H on the ticket.

Sources:
www.wikipedia.org
www.askoxford.com www.phrases.org.uk

I suggest that the mistake has been made from the full name of the Cruise Liner: Peninsular and Oriental Steam Navigation Company. Maybe a printing error produced P.O.S.H rather than P.O.S.N.C

A more factual defintion still derives from a shipping term which does not seem to be suggested on the previous source sites.

When boats leave a harbour the shipping lanes work to the rule that you must stay to the left hand side like on U.K roads. When leaving a harbour you therefore keep the Port lights of the shipping lane on the left and the Starboard on the right. However, when returning you keep the starboard lights on the left and the Port lights on the right. Hence Port Out Starboard Home... P.O.S.H

(Neva Stop Hustlin)- is an upcomming rap group comming out of the metropolitan MD, DC, VA Area. This group consist of 4 main members - M.P. ATM Kaos and Young C. This group is very motivativated to make it big and is determined to do whatever they can to make this dream become a reality. Known for their mindblowing beats and impressive lyrics, N.S.H. is not far from reaching their goal.

(Neva Stop Hustlin)- is an upcomming rap group comming out of the metropolitan MD, DC, VA Area. This group consist of 4 main members - M.P. ATM Kaos and Young C. This group is very motivativated to make it big and is determined to do whatever they can to make this dream become a reality. Known for their mindblowing beats and impressive lyrics, N.S.H. is not far from reaching their goal.

(Neva Stop Hustlin)- is an upcomming rap group comming out of the metropolitan MD, DC, VA Area. This group consist of 4 main members - M.P. ATM Kaos and Young C. This group is very motivativated to make it big and is determined to do whatever they can to make this dream become a reality. Known for their mindblowing beats and impressive lyrics, N.S.H. is not far from reaching their goal.

Plain and Simple.

Pre-Nicotine Syndrome. Describes the bitchy, cranky, irritable mindstate prior to having the day's first cigarette.