everybody and their mom

Used in place of "a lot of people"

Person 1: Did you see Jenny's "25 things" note?
Person 2: Yeah! Everybody and their mom is making one.

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everybody and their mom

More than just everybody. Same as adding 1 to an infinite number. Noun, never plural, always singular.

I tried to buy tickets to the Motley Crue tour, but everybody and their mom was there.

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Everybody and they mom's

This term is used when one is trying to exaggerate and talk about how someone socializes or communicates with a large group of people.

Person 1: I am not a social person.
Person 2: Oh really! Just last week you was telling everybody and they mom's about the shit that you were going through.