(informal, derogatory, chiefly, US) A large, imposing and ostentatious house that lacks architectural integrity.
Twenty mansions were planned for the development, each designed to look like the biggest house in town. The McMansion we thought of as ours had an enormous kitchen, more than two stories high.
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
See all Regional & Other slang on Slangora.