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The BosWash megalopolis is the name for a group of metropolitan areas in the northeastern United States, extending from Boston to Washington and linked by economics, transport, and communications. The high-speed Amtrak train, the Acela, runs the length of the BosWash area.

BosWash contains a reported population of 44 million, or 16% of the population of the United States, and four of the world's fifty largest metropolitan areas — Boston, New York, Philadelphia, and Washington.

The geographic trend was first identified in the 1961 book Megalopolis: The Urbanized Northeastern Seaboard of the United States by French geographer Jean Gottman.
What makes you think of fast-paced life, cultural diversity, great schools, lots of traffic, four seasons, city-life, suburbia, and beaches galore all within close proximity of each other?

BosWash
BosWash by Blaxican DC December 3, 2009
Words you can keep
The general term for any group of Eastern Europeans who will wash your car in a Tesco's car park for a fiver.
"Wow, my car's dirty. I can't be arsed to clean it myself, I'll go and get a boswash"
boswash by Michael A A February 7, 2008
Related Words
The crowded region of the Eastern seabord of the U.S steretching from Boston, MA to the Washington DC Metro area. It has about 30 million people or so and is known for its traffic, high cost of living, enormous diversity, bad weather and downright bad attitude and rudeness by most of its people.
I would NEVER live in the Boswash region: the people suck and so does the traffic and weather.
Boswash by krock1dk@yahoo.com January 9, 2008
belief; trust

a name in Nepal, a surname in India.
I have Biswash in him, so I will give him the money.
biswash by hyrsdfhecnyisopow March 8, 2016

bogwash blumpkin 

To balance on the seat of a toilet with your head down the bowl and your feet in the air, while both defecating and recieving fellatio from another man/women while he/she simultaneously pulls the chain.
I didn't feel like using the toilet properly or being the right-way-up, so I suggested to my girlfriend that we have a bogwash blumpkin
bogwash blumpkin by banananaman December 13, 2008
The Begging and the End. The everything and the nothing. Everyone you know every one you don’t know. The In between of the in between. The sole fabric of this reality. This is Boshash
Susijdhsudush BOSHASH Djjejdir BOINGG
BOING jejdjejkrjdjj BOSHASH
Boshash by A_Sweaty_Big_Man March 16, 2022
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Lookie at these bunch of narps, NARP NARP NARP
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