everyone and his mum

Used hyperbolically to express a large number or a majority of people. Primarily heard in UK. I'm so jealous, everyone and his mum is going on a vacation this summer except for me. I just wanted to have a small dinner party, and now you've invited everyone and his mum! What are we going to feed all these people? Everyone and his mum has that brand of smartphone. I'd rather have something a bit more unique.

everyone

see entries under every man.

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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