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The proverbial thing that mick, Marshall Dillon, used as a dildo.
"I got my Venus penis stuck inside of Jupiter's anus with the rings of Saturn stretched around the rings of Uranus & I pop Pluto's ploppings like a chicken plop pill though... like that mick Marshall Dillon used McMars as a dildo... when my body hair is growing from my pube's weeping willow down to all the pillow-biters that are biting their pillows. Go and break your fucking breakfast back out of your Brillo. I'll trade my number one status for a whole lot of nil though."
McMars by ANOTHERDEADROMEO April 30, 2023
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A large and pretentious house, typically
of shoddy construction, typical of "upscale" suburban developments in the late
20th and early 21st centuries. Such houses
are characterized by steep roofs of complex design, theatrical entrances, lack of stylistic integrity and backsides which are
notably less fussy than their fronts. They are often placed closely together to maximize the developer's profits and appeal to people who value perceived social status over actual, physical, economic or historic value.
Although Nancy is just a school teacher,
she mortgaged herself up to her neck to
buy a new McMansion on Woodbridge Road Court in Clayton Hills Valley Estates at North Pine River Hollow Meadows.
McMansion by Cireel Wittsberg November 15, 2004

McMansion Trash 

Very similar in behavior to trailer trash...An individual with the outside appearance of successful living (i.e. McMansion or large house, Mercedes in the driveway, trappings, etc)...yet in actuality, conducts his/her life like an animal in the zoo (i.e. heavy substance abuse, extramarital affairs, scandals, slumming, etc.)
Mr. Jones might look successful...but he's really McMANSION TRASH...
Bland, tasteless and generic - much like the food served at McDonalds.

Houses tend to be crammed together to maximize profits for developers. Only three people occupy at house with 5 bathrooms and enough garage space to hold a 737. Owners tend to be yuppies or yuppie wannabes.
McMansion - We can't find Mimi's house because they all look same
McMansion by glum68 October 7, 2008
those big generic, nauseating houses that you now see in suburbs. They're usually built by "home builders" and are put close together to increase profit for greedy land developers. They're very cheaply built and it probably took more time to ship in the equipment than it did to actually build the damn thing. On the outside they look like they are just patches of different incompatible architecture styles, and they usually look the same. THe yards are full of generic plants and bushes that the builders probably got from Wal-Mart. The walls are usually made of sheetrock and the backs of the "house" are less showy than their fronts.
Mcmansions have no real physical or historical value since they can barely last for one generation and they all look the same and are a piss stream's length away from the mcmansion next door.
Mcmansions tend to be bought by yuppies and soccer moms who just want to look like they're rich and don't care about actual physical or historical value.
Plus mcmansions contribute to urban sprawl which is bad for the environment since most of the new suburbs where these mcmansions exist were once rich farmland or irreplaceable woodland.
If you want a good example of a mcmansion, then if you're ever in Little Rock, go to Chenal Valley, It's nothing but mcmansions and soccer moms for miles.
mcmansion by Nathan575 June 29, 2008
a wicked awesome school in Ontario, Canada home to over 20, 000 students and faculty members, also home to some hot broads with big tits and also at the same time a large percentage of engineering and science nerds.
"Hey, where's your engineering degree from?"
"McMaster"
"ohh shit man, i bet you got mad pussy there AND a good degree"
"duh"
McMaster by Sam I ammmm June 15, 2008

McMastering 

Look at him out there McMastering.

He sure did McMaster that interview.
McMastering by Hoe Hay March 23, 2020