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1.
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.
by megatron5150 April 04, 2005
 
2.
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.
by Jamaal and Boquifa February 02, 2009