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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
Related Words
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

bollywasher

A large-sized marble (toy), typically 20mm or more. In Liverpool, a corruption of 'bottle washer'; the combination of spherical glass stopper and rubber washer used to seal a Codd Bottle which was designed specifically for carbonated drinks. Children smashed the bottles to retrieve the marbles.
Ay soft-lad! You can't play a cats-eye with a ordinary marble - you have to play another cats-eye or a bollywasher.
bollywasher by Heurrgh July 11, 2018
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

Bottywash 

A warm, soapy, bottom washing ritual
where the wash-ee feels they are benefitting, when in fact the wash-er has deceived them with their cunning and then forced their will upon them
I wasn’t go to stay late at work but I got a Bottywash from the bosses

I only went for the free holiday but I got a Bottywash and now I own part of a timeshare
Bottywash by Danger Hugo November 21, 2023

Breadhead 

Someone who is addicted to obtaining money and building wealth. A money addict and fanatic. Breadheads often work more than one full-time job, and some even participate in illicit activities to "obtain the bread".
A breadhead is like a crackhead, but for money instead of crack.
Breadhead by 🅱️ U S 3 4 8 March 30, 2022