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A loser's term of jealousy for a nice house he or she can never afford.
"Did you hear how well Susie's doing? You know we used to all make fun of her in school, well I hear she's got a good job and just bought a beautiful new home."

"Yeah, she's just the type who'd buy a McMansion. I'm happy with my double-wide in the trailer park, it's more 'real.'"
mcmansion by Doubletrouble May 15, 2013
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a house that has been super sized
I used to lice in a shack but ever since I added those thirteen extra rooms, I live in a mcmansion.
McMansion by sarcomax January 20, 2003
A large starter home built with synthetic materials and has noticeable arches located at the patio/entry that resemble the McDonald's arch
How much did that guy sell his McMansion located in Bakersfield?

1.5 million dollars!!!
McMansion by bbobcali661 May 1, 2023
Originally a large starter home for someone from the middle class entering into the upperclass status and has arches at the front patio/entry that resembles McDonald's arches.
How much did a McMansion in Bakersfield sold for?

1.5 million dollars!!!
McMansion by bbobcali661 May 6, 2023
A colloquial term used on Long Island (Western Nassau County area) used to refer to the McDonalds location in New Hyde Park. It is less commonly known as the Denton House, named after its creator, Joseph Denton, who built it in 1795. It was acquired by McDonalds in 1985.
Somebody: Woah is that huge McDonalds building over there?
Long Islander: Oh, what we call that the McMansion! Their prices are somewhat expensive though!
McMansion by UltraGamer969 February 26, 2024